Home » Server Options » Text & interMedia » Find Words in a String (11g Release 2 Windows)
Find Words in a String [message #618415] Fri, 11 July 2014 10:15 Go to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Anyone have a query that can find WORDS in a String and break out those words?

User types in "George Washington" into an input field and that string is passed to an Oracle procedure where the words are split out.

It's also possible that a user could type in "George Washington DC" so it's not always limited to just 2 words.


Input_String = 'George Washington';

procedure XYZ (Input_String  in  varchar2,
               Results       out sys_refcursor)


begin

open Results for 
  select column1,
         column2,
         column3,
         .
         .
         column20
    from presidents_table
      where first_name = WORD1 or
            last_name  = WORD2

end

Re: Find Words in a String [message #618416 is a reply to message #618415] Fri, 11 July 2014 10:22 Go to previous messageGo to next message
Michel Cadot
Messages: 65203
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator

SQL> with
  2    data as (
  3      select 1 id, 'George Washington' data from dual
  4      union all
  5      select 2, 'George Washington DC' from dual
  6    )
  7  select id, to_number(column_value) word_nb,
  8         regexp_substr(data, '[^ ]+', 1, column_value) word
  9  from data,
 10       table(cast(multiset(select level from dual connect by level<=regexp_count(data,' ')+1)
 11                  as sys.odcivarchar2list))
 12  order by 1, 2
 13  /
        ID    WORD_NB WORD
---------- ---------- ----------
         1          1 George
         1          2 Washington
         2          1 George
         2          2 Washington
         2          3 DC

Re: Find Words in a String [message #618417 is a reply to message #618416] Fri, 11 July 2014 10:42 Go to previous messageGo to next message
Lalit Kumar B
Messages: 3123
Registered: May 2013
Location: World Wide on the Web
Senior Member
Seems like requirement is to finally search the president table with any of the passed names, first,or last etc... In that case, the WHERE clause in OP's query cannot be static. It will dynamically change.

@OP, can you confirm if that's the final requirement or Michel's solution suffices your requirement?
Re: Find Words in a String [message #618420 is a reply to message #618417] Fri, 11 July 2014 11:00 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
I'll have to digest what Michel is doing but I believe what he has posted will work. I'm going to make the assumption that the user will start off with a last name and then move to a first name and then maybe something else. My query will just need to take those values and go against the correct columns when querying the table. I still need to think this completely through but I wanted to see if someone had a query to at least break the words up.
Re: Find Words in a String [message #618421 is a reply to message #618415] Fri, 11 July 2014 11:21 Go to previous messageGo to next message
John Watson
Messages: 7150
Registered: January 2010
Location: Global Village
Senior Member
Use a Context index?
orclz>
orclz> create index sh.ctxi on sh.customers(cust_street_address)
  2  indextype is ctxsys.context;

Index created.

orclz>
orclz> select cust_street_address from customers
  2  where contains(cust_street_address,'Oxford')>0 and rownum < 10;

CUST_STREET_ADDRESS
----------------------------------------
47 North Oxford Road
17 West Oxford Court
77 South Oxford Avenue
67 East Oxford Avenue
37 Oxford Street
97 West Oxford Avenue
117 Oxford Avenue
67 West Oxford Avenue
17 North Oxford Court

9 rows selected.

orclz>
Re: Find Words in a String [message #618426 is a reply to message #618421] Fri, 11 July 2014 11:33 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
That's using Oracle Text, correct? I've been looking at that because what I'm tying to do is an autocomplete that is fast. Meaning, the user types in "Washington" and then maybe "Washington G" and I quickly bring back a result set that has those names. Same thing when searching for courses like "Dentistry Tee", "Dentistry Teeth" , "History George Washington" or just "Hist America". The search has to be fast and contain words that the user is typing in.
temp topic to be merged don't reply in it. [message #618513 is a reply to message #618415] Sat, 12 July 2014 10:47 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
When using the CTXSYS.CONTEXT index does it matter how the words are arranged when getting results?


CREATE TABLE SEARCH
(
  SRCH           VARCHAR2(500 BYTE)
)

CREATE INDEX SEARCH_CTXI ON SEARCH
(SRCH)
INDEXTYPE IS CTXSYS.CONTEXT
NOPARALLEL;


SRCH Column

WS2000 LIFE-SCI  499G 1 11965 UNDERGRAD RSCH-CELL BIOL
WS2000 MEDICINE  340R 1 11991 HEMATOLOGY/ONCOLOGY I
WS2000 MEDICINE  471R 1 11981 CARD FELLOWSHIP I

MEDICINE WS2000  472R 1 11982 CARD FELLOWSHIP II




So, using a CONTAINS with 'MEDICINE' would result in 3 rows. 'WS2000' would pull up 4 rows. 'WS2000 MEDICINE' doesn't pull up any rows?
Re: Find Words in a String [message #618514 is a reply to message #618513] Sat, 12 July 2014 11:00 Go to previous messageGo to next message
Lalit Kumar B
Messages: 3123
Registered: May 2013
Location: World Wide on the Web
Senior Member
Reading documentation to know how it works?
Re: Find Words in a String [message #618515 is a reply to message #618514] Sat, 12 July 2014 11:45 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Did some. Starting to think I should be using a CONTEXT index instead of what I'm trying to make work. I just thought someone might know.
Re: Find Words in a String [message #618516 is a reply to message #618515] Sat, 12 July 2014 11:54 Go to previous messageGo to next message
Lalit Kumar B
Messages: 3123
Registered: May 2013
Location: World Wide on the Web
Senior Member
Your case is just to search for a single row based on a wild search of first, middle or last name in a column. So I don't feel you need to go for text search. However, there are so many experts in this forum, they might defer from what I believe. So don't conclude in hurry, wait for their suggestions too Smile
Re: Find Words in a String [message #618517 is a reply to message #618426] Sat, 12 July 2014 12:05 Go to previous messageGo to next message
Michel Cadot
Messages: 65203
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator

Rest of topic hijacked by sss111ind is move to Text & interMedia forum with name "How to use Oracle text".

Re: Find Words in a String [message #618522 is a reply to message #618517] Sat, 12 July 2014 12:47 Go to previous messageGo to next message
Michel Cadot
Messages: 65203
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator

@Duane & Lalit
I removed from the other topic and merged back some posts to this topic, tell me if some are still missing or misplaced.

[Updated on: Sat, 12 July 2014 12:48]

Report message to a moderator

Re: Find Words in a String [message #618524 is a reply to message #618522] Sat, 12 July 2014 13:13 Go to previous messageGo to next message
Lalit Kumar B
Messages: 3123
Registered: May 2013
Location: World Wide on the Web
Senior Member
@Michel, I reviewed both the topics, and it seems that you have perfectly taken care of topic split and merge of comments. A complementing comment in each topic is left which makes sense to the previous comments in each topic respectively, so all is well.

Thank you Michel for the effort.
Re: Find Words in a String [message #618527 is a reply to message #618421] Sat, 12 July 2014 13:26 Go to previous messageGo to next message
Solomon Yakobson
Messages: 2675
Registered: January 2010
Location: Connecticut, USA
Senior Member
Just one note - by default context index is not updated along with table inserts:

SQL> select * from tbl;

W
------------------------------
ox ford
ox-ford
oxford

SQL> insert into tbl values('Oxford Town Hall');

1 row created.

SQL> select w from tbl where contains(w,'Oxford') > 0;

W
------------------------------
oxford

SQL> commit;

Commit complete.

SQL> select w from tbl where contains(w,'Oxford') > 0;

W
------------------------------
oxford

SQL> delete tbl where w = 'Oxford Town Hall';

1 row deleted.

SQL> commit;

Commit complete.

SQL> drop index tbl_idx1;

Index dropped.

SQL> create index tbl_idx1 on tbl(w) indextype is ctxsys.context parameters('transactional');

Index created.

SQL> select * from tbl;

W
------------------------------
ox ford
ox-ford
oxford

SQL> insert into tbl values('Oxford Town Hall');

1 row created.

SQL> select w from tbl where contains(w,'Oxford') > 0;

W
------------------------------
oxford
Oxford Town Hall

SQL>


SY.
Re: Find Words in a String [message #618529 is a reply to message #618527] Sat, 12 July 2014 13:58 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member

CREATE TABLE BLACKBOARD_COURSE_SEARCH
(
  SRCH           VARCHAR2(500 BYTE)
)

CREATE INDEX BK_COURSE_SEARCH_CTXI ON BLACKBOARD_COURSE_SEARCH
(SRCH)
INDEXTYPE IS CTXSYS.CONTEXT
NOPARALLEL;

SET DEFINE OFF;
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 LIFE-SCI  499G 1 11965 UNDERGRAD RSCH-CELL BIOL');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  340R 1 11991 HEMATOLOGY/ONCOLOGY I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 EDUC  575 1 11963 INTERNSHIP');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 FRN-LNG  899 1 11953 REQUIRED GRAD ENROLLMENT');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 OR-SURG  705 1 11989 CLIN ORAL SURGERY II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  375R 1 11990 RADIOLOGY II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  334R 1 11986 FAMILY MED/OFF PRAC I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  559R 1 11987 OB-GYN OFF PRAC I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 OR-SURG  702 1 11988 PRIN ORAL SURGERY III');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 ACCORD  102 1 11976 FRESHMAN ACCORDION II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 CIV-ENGR  274 1 11961 CVL ENGNRNG SYSTEMS DSGN');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 CIV-ENGR  300 1 11962 PROBLEMS');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 OR-SURG  720 1 11985 ORAL SURG HOSP RES I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 FRENCH  290 1 11975 SP INTER FRENCH TOPS II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  350R 1 11960 NEPHROLOGY I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 OR-SURG  701 1 11984 PRIN ORAL SURGERY II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 ENGR  390 1 11973 ENGR COOP/INTERNSHIP');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MC-ENGR  301A 1 11974 TPCS MECH & AEROSPC ENGR');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 TROMB  601 1 11958 GRAD TROMB-DOCTRL PERF');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 CELLO  100C 1 11994 APPLD STDY NON-MUSIC MAJ');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  471R 1 11981 CARD FELLOWSHIP I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  472R 1 11982 CARD FELLOWSHIP II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  473R 1 11983 CARD FELLOWSHIP III');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  452RR 1 11959 PED HEMATOLOGY/ONCOLOGY');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 EDUC-UL  522 1 11957 SCH ORG CUL CON CHANGE');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 PUB-ADM  581 1 11993 SEM URBAN ADMINISTRATION');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  393R 1 11979 MEDICAL INTENSIVE CARE I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 PHYSICS  490 1 11971 SPECIAL PROBLEMS');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 EL-ENGR  300K 1 11972 PROBLEMS IN ECE');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  320R 1 11980 ALLERGY/IMMUNOLOGY I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 THEATER  532A 1 11955 PROF COSTUME DESIGN');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 EL-ENGR  490 1 11956 RESEARCH');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  115R 1 11978 MEDICAL TERMINOLOGY');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 SPANISH     H211 1 11969 HONORS:SECOND YR SPAN I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 PSYCH  450SA 1 11970 SPECIAL TOPICS');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 A&S  402 1 11968 SENIOR HONORS COLLOQUIUM');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 STR-BASS  102 1 12000 FRESHMAN STRING BASS II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 EDUC  564 1 11997 IS: HIST HIGHER ED');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  593R 1 11995 STUDIES ON CHEM DEPENDNC');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 BMS  413 1 11996 MEDICAL MICROBIOLOGY');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 NURSE  899 1 12002 REQUIRED GRAD ENROLLMENT');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  442R 1 11998 PEDIATRIC OFF PRAC I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 SAXOPH  202 1 11999 SOPHOMORE SAXOPHONE II');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 GEOG  503 1 12004 HISTRY & PHILSY GEOGRPHY');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  601 1 12003 INT MED/DOC INST YR 6');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 CJC  599 1 12001 RESEARCH AND THESIS');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 LIFE-SCI  497L 1 11966 SPECIAL TPCS-BIOL SCIENC');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 A&S  400G 1 11967 SPECIAL READINGS/TOPICS');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  332R 1 11964 ENDOCRINOLOGY I');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 RELIG-ST  697RS 1 11954 DOCTRL LVL INDEP READING');
Insert into BLACKBOARD_COURSE_SEARCH
   (SRCH)
 Values
   ('WS2000 MEDICINE  360R 1 11992 PATHOLOGY/SURGICAL I');
COMMIT;

select *
  from blackboard_course_search
    where contains(srch, SrchWords) > 0 and 
          rownum                    < 50



If I try 'WS2000 11968' then I don't get any results.

SrchWords = 'WS2000 11968';

Can you get it to work?
Re: Find Words in a String [message #618535 is a reply to message #618529] Sat, 12 July 2014 14:30 Go to previous messageGo to next message
Solomon Yakobson
Messages: 2675
Registered: January 2010
Location: Connecticut, USA
Senior Member
1. You created non-transactional context index before inserting rows. So index is empty. You need to create index as:

CREATE INDEX BK_COURSE_SEARCH_CTXI ON BLACKBOARD_COURSE_SEARCH
(SRCH)
INDEXTYPE IS CTXSYS.CONTEXT
NOPARALLEL
PARAMETERS('TRANSACTIONAL');


2. SrchWords = 'WS2000 11968' is two words, so you need to tell CONTAINS are you looking for both or any of them. Both of them:

select *
  from blackboard_course_search
    where contains(srch,'WS2000 & 11968') > 0
/
SRCH
-------------------------------------------------

WS2000 A&S  402 1 11968 SENIOR HONORS COLLOQUIUM

SQL> 


Any of them:

select *
  from blackboard_course_search
    where contains(srch,'WS2000 | 11968') > 0
/


SY.
Re: Find Words in a String [message #618539 is a reply to message #618535] Sat, 12 July 2014 15:18 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Ah, gotcha. I knew I was doing something wrong but just didn't know what it was.
Re: Find Words in a String [message #618545 is a reply to message #618535] Sat, 12 July 2014 16:04 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
I believe I already know the answer but I thought I would confirm.

You must do 'WS2000 & 11968' or 'WS2000 | 11968' between the words and NOT JUST 'WS2000 11968'? Is there any way around not doing "&" or "|" and getting the same results?
Re: Find Words in a String [message #618547 is a reply to message #618545] Sat, 12 July 2014 16:52 Go to previous messageGo to next message
Solomon Yakobson
Messages: 2675
Registered: January 2010
Location: Connecticut, USA
Senior Member
No, but assuming SrchWords is one or more spcae separated words:

select *
  from blackboard_course_search
    where contains(srch,replace(SrchWords,' ','&')) > 0
/


For example:

SQL> select *
  2    from blackboard_course_search
  3      where contains(srch,replace('WS2000 11968',' ','&')) > 0
  4  /

SRCH
------------------------------------------------------------------

WS2000 A&S  402 1 11968 SENIOR HONORS COLLOQUIUM

SQL>


SY.
Re: Find Words in a String [message #618548 is a reply to message #618547] Sat, 12 July 2014 17:06 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
That worked. Thanks.
Re: Find Words in a String [message #618549 is a reply to message #618426] Sat, 12 July 2014 23:40 Go to previous messageGo to next message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
Duane wrote on Fri, 11 July 2014 09:33
That's using Oracle Text, correct? I've been looking at that because what I'm tying to do is an autocomplete that is fast. Meaning, the user types in "Washington" and then maybe "Washington G" and I quickly bring back a result set that has those names. Same thing when searching for courses like "Dentistry Tee", "Dentistry Teeth" , "History George Washington" or just "Hist America". The search has to be fast and contain words that the user is typing in.


Oracle Text has a lot of options. The following example demonstrates a few of them. I have used a bind variable for the search terms for maximum efficiency. I have then modified the search terms within the query to allow for similarity in spelling and ending wildcard for each term. I have also used the accum operator to affect the scoring. I have then used that text scoring and edit_distance_similarity to order the results. It is important to note that you must order the results within an inner sub-query, then select the number of rows from an outer sub-query; Otherwise, you just get the first 50 random rows that match the criteria, not the closest matches in order. I have included columns for ranking, text score, and edit_distance_similarity, so that you can see how the scoring affects the order, but you could use any one or combination of them that you like. The accum operator makes it so that the more separate terms that match, the higher the score. The following demonstrates the type of searches that a user might enter, gradually refining the search, changing the order of the results, similar to the auto complete that you have asked for. This is just a small sampling of some of the features available in Oracle Text.

SCOTT@orcl12c> VARIABLE SrchWords VARCHAR2(100)
SCOTT@orcl12c> EXEC :SrchWords := 'Washington'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> SELECT *
  2  FROM   (SELECT DENSE_RANK () OVER
  3  		      (ORDER BY SCORE(1) DESC,
  4  				UTL_MATCH.EDIT_DISTANCE_SIMILARITY (srch, :SrchWords) DESC)
  5  		      AS ranking,
  6  		    SCORE(1) text_score,
  7  		    UTL_MATCH.EDIT_DISTANCE_SIMILARITY (srch, :SrchWords) eds,
  8  		    srch
  9  	     FROM   blackboard_course_search
 10  	     WHERE  CONTAINS
 11  		      (srch,
 12  		       '?' || REPLACE (:SrchWords, ' ', '% ACCUM ?') || '%',
 13  		       1) > 0
 14  	     ORDER  BY ranking)
 15  WHERE  ROWNUM < 50
 16  /

   RANKING TEXT_SCORE        EDS SRCH
---------- ---------- ---------- -------------------------------------------
         1          3        100 Washington
         2          3         59 George Washington
         3          3         56 General Washington
         4          3         50 Booker T. Washington
         5          3         40 General George Washington
         6          3         38 George Washington's history
         7          3         32 The History of George Washington
         8          3         24 The History of George Washington in America

8 rows selected.

SCOTT@orcl12c> EXEC :Srchwords := 'Washington G'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING TEXT_SCORE        EDS SRCH
---------- ---------- ---------- -------------------------------------------
         1         52         48 George Washington
         2         52         45 General Washington
         3         52         41 George Washington's history
         4         52         32 General George Washington
         5         52         26 The History of George Washington in America
         6         52         25 The History of George Washington
         7          2         84 Washington
         8          2         40 Booker T. Washington

8 rows selected.

SCOTT@orcl12c> EXEC :Srchwords := 'George Washington'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING TEXT_SCORE        EDS SRCH
---------- ---------- ---------- -------------------------------------------
         1         52        100 George Washington
         2         52         68 General George Washington
         3         52         63 George Washington's history
         4         52         54 The History of George Washington
         5         52         40 The History of George Washington in America
         6          2         78 General Washington
         7          2         65 Booker T. Washington
         8          2         59 Washington

8 rows selected.

SCOTT@orcl12c> EXEC :Srchwords := 'History George Washington'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING TEXT_SCORE        EDS SRCH
---------- ---------- ---------- -------------------------------------------
         1         68         79 The History of George Washington
         2         68         59 The History of George Washington in America
         3         68         34 George Washington's history
         4         34         72 General George Washington
         5         34         68 George Washington
         6          1         52 General Washington
         6          1         52 Booker T. Washington
         7          1         40 Washington
         8          1         28 The History of America
         9          1         16 American History

10 rows selected.

SCOTT@orcl12c> EXEC :Srchwords := 'History George Washington America'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING TEXT_SCORE        EDS SRCH
---------- ---------- ---------- -------------------------------------------
         1         76         77 The History of George Washington in America
         2         51         55 The History of George Washington
         3         51         49 George Washington's history
         4         26         55 General George Washington
         5         26         52 George Washington
         6         26         40 The History of America
         7         26         19 American History
         8          1         40 Booker T. Washington
         8          1         40 General Washington
         9          1         31 Washington

10 rows selected.



Re: Find Words in a String [message #618637 is a reply to message #618549] Mon, 14 July 2014 08:30 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Thanks Barbara. This is great.
Re: Find Words in a String [message #619353 is a reply to message #618549] Mon, 21 July 2014 16:12 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
What are the question marks doing? I'm just trying to understand and learn.


CONTAINS
(srch,
'?' || REPLACE (:SrchWords, ' ', '% ACCUM ?') || '%',
1) > 0
Re: Find Words in a String [message #619389 is a reply to message #619353] Tue, 22 July 2014 03:41 Go to previous messageGo to next message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
Duane wrote on Mon, 21 July 2014 14:12
What are the question marks doing? I'm just trying to understand and learn.


CONTAINS
(srch,
'?' || REPLACE (:SrchWords, ' ', '% ACCUM ?') || '%',
1) > 0


The ? is the fuzzy operator that searches for similarly spelled words.
Re: Find Words in a String [message #619750 is a reply to message #618549] Thu, 24 July 2014 16:12 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Barbara,

Do you have any suggestions or recommendations on how I might handle a situation where a user might want to search on a course and instructor? What I have now is they select a "by Course Info" or "by Instructor" button and they are either searching the "course_search" or "instructor_search" column using the query you provided. That works great but I know what's coming and I'm sure they will ask for a way to search by course and instructor.

With that in mind. Would it be feasible to include everything in one column? (e.g. SP2008 TUBA 402 0001 16953 SENIOR TUBA II INSTRUCTOR1 INSTRUCTOR2 INSTRUCTOR3... SP2008 TRUMPET 101 0001 16923 FRESHMAN TRUMPET I INSTRUCTOR1) Or is there a better way to keep the two columns, "course_search" and "instructor_search", and somehow break up the entered text and go against the correct column?

Words = "SS2007 MATH CROSS"

Course = "SS2007 MATH"

Instructor = "CROSS"

Like:
where contains(course_search, '%'||replace(Words, ' ', '% ACCUM ?')||'%', 1) > 0 or
contains(instructor_search, '%'||replace(Words, ' ', '% ACCUM ?')||'%', 1) > 0


course_search                                           instructor_search

SP2008 COMM-ST 312 0005 16565 ADVANCED PUBLIC SPEAKING   WASHINGTON GEORGE
SP2008 COMM-ST 314WI 0001 16568 REPORTING                BUSH GEORGE
SP2008 COMM-ST 317 0001 16569 PERSUASION                 POE R
Re: Find Words in a String [message #619751 is a reply to message #619750] Thu, 24 July 2014 17:18 Go to previous messageGo to next message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
I would maintain two separate columns in the table and two separate search options and allow them to use either one or both. I would use a multi_column_datastore and section group with sections to enable searching within either one or both sections using only one text domain index hit for maxiimum efficiency. Please see the demonstration below.

-- table:
SCOTT@orcl12c> CREATE TABLE blackboard_course_search
  2    (course_search	   VARCHAR2(60),
  3  	instructor_search  VARCHAR2(20),
  4  	srch		   VARCHAR2(1))
  5  /

Table created.


-- multi_column_datastore:
SCOTT@orcl12c> BEGIN
  2    CTX_DDL.CREATE_PREFERENCE ('test_ds', 'MULTI_COLUMN_DATASTORE');
  3    CTX_DDL.SET_ATTRIBUTE ('test_ds', 'COLUMNS', 'course_search, instructor_search');
  4  END;
  5  /

PL/SQL procedure successfully completed.


-- transactional index using multi_column_datastore and auto_section_group:
SCOTT@orcl12c> CREATE INDEX bk_course_search_ctxi
  2  ON blackboard_course_search (srch)
  3  INDEXTYPE IS CTXSYS.CONTEXT
  4  PARAMETERS
  5    ('TRANSACTIONAL
  6  	 DATASTORE test_ds
  7  	 SECTION GROUP CTXSYS.AUTO_SECTION_GROUP')
  8  /

Index created.


-- data:
SCOTT@orcl12c> SET DEFINE OFF
SCOTT@orcl12c> INSERT ALL
  2  INTO blackboard_course_search VALUES
  3    ('SP2008 COMM-ST 312 0005 16565 ADVANCED PUBLIC SPEAKING', 'WASHINGTON GEORGE', NULL)
  4  INTO blackboard_course_search VALUES
  5    ('SP2008 COMM-ST 314WI 0001 16568 REPORTING', 'BUSH GEORGE', NULL)
  6  INTO blackboard_course_search VALUES
  7    ('SP2008 COMM-ST 317 0001 16569 PERSUASION', 'POE R', NULL)
  8  INTO blackboard_course_search VALUES
  9    ('SS2007 MATH', 'CROSS', NULL)
 10  INTO blackboard_course_search VALUES
 11    ('SS2007 MATH', 'SOMEBODY', NULL)
 12  INTO blackboard_course_search VALUES
 13    ('WHATEVER', 'CROSS', NULL)
 14  SELECT * FROM DUAL
 15  /

6 rows created.

SCOTT@orcl12c> COMMIT
  2  /

Commit complete.


-- variables for search:
SCOTT@orcl12c> VARIABLE by_course_info VARCHAR2(100)
SCOTT@orcl12c> VARIABLE by_instructor  VARCHAR2(100)


-- search by both course info and instructor info:
SCOTT@orcl12c> EXEC :by_course_info := 'SS2007 MATH'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> EXEC :by_instructor := 'CROSS'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> COLUMN course_search FORMAT A20
SCOTT@orcl12c> COLUMN instructor_search FORMAT A20
SCOTT@orcl12c> SET AUTOTRACE ON EXPLAIN
SCOTT@orcl12c> SELECT *
  2  FROM   (SELECT DENSE_RANK () OVER
  3  		      (ORDER BY SCORE(1) DESC,
  4  				UTL_MATCH.EDIT_DISTANCE_SIMILARITY
  5  				  (course_search, :by_course_info) DESC,
  6  				UTL_MATCH.EDIT_DISTANCE_SIMILARITY
  7  				  (instructor_search, :by_instructor) DESC)
  8  		      AS ranking,
  9  		    SCORE(1) text_score,
 10  		    UTL_MATCH.EDIT_DISTANCE_SIMILARITY (course_search, :by_course_info) csim,
 11  		    UTL_MATCH.EDIT_DISTANCE_SIMILARITY (instructor_search, :by_instructor) isim,
 12  		    course_search,
 13  		    instructor_search
 14  	     FROM   blackboard_course_search
 15  	     WHERE  CONTAINS
 16  		      (srch,
 17  		       RTRIM
 18  			 (NVL2
 19  			   (:by_course_info,
 20  			    '?' || REPLACE (:by_course_info, ' ', '% WITHIN course_search ACCUM ?')
 21  				|| '% within course_search ACCUM ',
 22  			    NULL) ||
 23  			  NVL2
 24  			    (:by_instructor,
 25  			     '?' || REPLACE (:by_instructor, ' ', '% WTHIN instructor_search ACCUM ?')
 26  				 || '% WITHIN instructor_search',
 27  			     NULL),
 28  			  ' ACCUM '),
 29  		       1) > 0
 30  	     ORDER  BY ranking)
 31  WHERE  ROWNUM < 50
 32  /

   RANKING TEXT_SCORE       CSIM       ISIM COURSE_SEARCH        INSTRUCTOR_SEARCH
---------- ---------- ---------- ---------- -------------------- --------------------
         1         68        100        100 SS2007 MATH          CROSS
         2         34        100         13 SS2007 MATH          SOMEBODY
         3          1          0        100 WHATEVER             CROSS

3 rows selected.


Execution Plan
----------------------------------------------------------
Plan hash value: 1244607283

-----------------------------------------------------------------------------------------------------------
| Id  | Operation                      | Name                     | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT               |                          |     1 |    96 |     4   (0)| 00:00:01 |
|*  1 |  COUNT STOPKEY                 |                          |       |       |            |          |
|   2 |   VIEW                         |                          |     1 |    96 |     4   (0)| 00:00:01 |
|   3 |    WINDOW SORT                 |                          |     1 |    58 |     4   (0)| 00:00:01 |
|   4 |     TABLE ACCESS BY INDEX ROWID| BLACKBOARD_COURSE_SEARCH |     1 |    58 |     4   (0)| 00:00:01 |
|*  5 |      DOMAIN INDEX              | BK_COURSE_SEARCH_CTXI    |       |       |     4   (0)| 00:00:01 |
-----------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<50)
   5 - access("CTXSYS"."CONTAINS"("SRCH",RTRIM(NVL2(:BY_COURSE_INFO,'?'||REPLACE(:BY_COURSE_INFO,'
              ','% WITHIN course_search ACCUM ?')||'% within course_search ACCUM
              ',NULL)||NVL2(:BY_INSTRUCTOR,'?'||REPLACE(:BY_INSTRUCTOR,' ','% WTHIN instructor_search ACCUM
              ?')||'% WITHIN instructor_search',NULL),' ACCUM '),1)>0)

Note
-----
   - dynamic statistics used: dynamic sampling (level=2)

SCOTT@orcl12c> SET AUTOTRACE OFF


-- search by course info only;
SCOTT@orcl12c> EXEC :by_course_info := 'SS2007 MATH'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> EXEC :by_instructor := NULL

PL/SQL procedure successfully completed.

SCOTT@orcl12c> SET AUTOTRACE ON EXPLAIN
SCOTT@orcl12c> /

   RANKING TEXT_SCORE       CSIM       ISIM COURSE_SEARCH        INSTRUCTOR_SEARCH
---------- ---------- ---------- ---------- -------------------- --------------------
         1         52        100          0 SS2007 MATH          CROSS
         1         52        100          0 SS2007 MATH          SOMEBODY

2 rows selected.


Execution Plan
----------------------------------------------------------
Plan hash value: 1244607283

-----------------------------------------------------------------------------------------------------------
| Id  | Operation                      | Name                     | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT               |                          |     1 |    96 |     4   (0)| 00:00:01 |
|*  1 |  COUNT STOPKEY                 |                          |       |       |            |          |
|   2 |   VIEW                         |                          |     1 |    96 |     4   (0)| 00:00:01 |
|   3 |    WINDOW SORT                 |                          |     1 |    58 |     4   (0)| 00:00:01 |
|   4 |     TABLE ACCESS BY INDEX ROWID| BLACKBOARD_COURSE_SEARCH |     1 |    58 |     4   (0)| 00:00:01 |
|*  5 |      DOMAIN INDEX              | BK_COURSE_SEARCH_CTXI    |       |       |     4   (0)| 00:00:01 |
-----------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<50)
   5 - access("CTXSYS"."CONTAINS"("SRCH",RTRIM(NVL2(:BY_COURSE_INFO,'?'||REPLACE(:BY_COURSE_INFO,'
              ','% WITHIN course_search ACCUM ?')||'% within course_search ACCUM
              ',NULL)||NVL2(:BY_INSTRUCTOR,'?'||REPLACE(:BY_INSTRUCTOR,' ','% WTHIN instructor_search ACCUM
              ?')||'% WITHIN instructor_search',NULL),' ACCUM '),1)>0)

Note
-----
   - dynamic statistics used: dynamic sampling (level=2)

SCOTT@orcl12c> SET AUTOTRACE OFF


-- search by instructor only:
SCOTT@orcl12c> EXEC :by_course_info := NULL

PL/SQL procedure successfully completed.

SCOTT@orcl12c> EXEC :by_instructor := 'CROSS'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> SET AUTOTRACE ON EXPLAIN
SCOTT@orcl12c> /

   RANKING TEXT_SCORE       CSIM       ISIM COURSE_SEARCH        INSTRUCTOR_SEARCH
---------- ---------- ---------- ---------- -------------------- --------------------
         1          3          0        100 SS2007 MATH          CROSS
         1          3          0        100 WHATEVER             CROSS

2 rows selected.


Execution Plan
----------------------------------------------------------
Plan hash value: 1244607283

-----------------------------------------------------------------------------------------------------------
| Id  | Operation                      | Name                     | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT               |                          |     1 |    96 |     4   (0)| 00:00:01 |
|*  1 |  COUNT STOPKEY                 |                          |       |       |            |          |
|   2 |   VIEW                         |                          |     1 |    96 |     4   (0)| 00:00:01 |
|   3 |    WINDOW SORT                 |                          |     1 |    58 |     4   (0)| 00:00:01 |
|   4 |     TABLE ACCESS BY INDEX ROWID| BLACKBOARD_COURSE_SEARCH |     1 |    58 |     4   (0)| 00:00:01 |
|*  5 |      DOMAIN INDEX              | BK_COURSE_SEARCH_CTXI    |       |       |     4   (0)| 00:00:01 |
-----------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(ROWNUM<50)
   5 - access("CTXSYS"."CONTAINS"("SRCH",RTRIM(NVL2(:BY_COURSE_INFO,'?'||REPLACE(:BY_COURSE_INFO,'
              ','% WITHIN course_search ACCUM ?')||'% within course_search ACCUM
              ',NULL)||NVL2(:BY_INSTRUCTOR,'?'||REPLACE(:BY_INSTRUCTOR,' ','% WTHIN instructor_search ACCUM
              ?')||'% WITHIN instructor_search',NULL),' ACCUM '),1)>0)

Note
-----
   - dynamic statistics used: dynamic sampling (level=2)

SCOTT@orcl12c>

Re: Find Words in a String [message #619752 is a reply to message #619751] Thu, 24 July 2014 17:19 Go to previous messageGo to next message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
I am going to move this thread to the text forum, since that seems to be what is has become about.
Re: Find Words in a String [message #619856 is a reply to message #619751] Fri, 25 July 2014 09:43 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Hi Barbara,

I misled you some on what would be entered. Right now, they can search by course or instructor by clicking a button for each option but I'm not sure how I would break up the text for each variable if "SS2007 MATH CROSS" was entered.

My example I gave you broke out the course and instructor (see below). I did this to show you what was the course information and what was the instructor information but the actual information may be something like "course information instructor name", "course information", "instructor information". So, basically, they want the ability to search 3 different ways and obtain the correct results.

I'm guessing I could still use your queries but maybe replace "by_course_info" and "by_instructor" with just "Words". I'll let you comment on whether that will work or not.

Example entry with parsed values from my post

Words = "SS2007 MATH CROSS"

Course = "SS2007 MATH"

Instructor = "CROSS"

__________________________________

How users might enter data

Words = "SS2007 MATH CROSS"

Words = "GEORGE WASHINGTON"

Words = "315 MATH WASHINGTON"

Words = "HEMATOLOGY/ONCOLOGY"

Words = "SS2007 HEMATOLOGY/ONCOLOGY BUSH G"


I hope I'm not confusing you more with this post. If you need additional information, let me know.

Re: Find Words in a String [message #619872 is a reply to message #619856] Fri, 25 July 2014 11:35 Go to previous messageGo to next message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
In that case, I would use the multi_column_datastore, but without sections, as shown below.

SCOTT@orcl12c> CREATE TABLE blackboard_course_search
  2    (course_search	   VARCHAR2(60),
  3  	instructor_search  VARCHAR2(20),
  4  	srch		   VARCHAR2(1))
  5  /

Table created.

SCOTT@orcl12c> BEGIN
  2    CTX_DDL.CREATE_PREFERENCE ('test_ds', 'MULTI_COLUMN_DATASTORE');
  3    CTX_DDL.SET_ATTRIBUTE ('test_ds', 'COLUMNS', 'course_search, instructor_search');
  4  END;
  5  /

PL/SQL procedure successfully completed.

SCOTT@orcl12c> CREATE INDEX bk_course_search_ctxi
  2  ON blackboard_course_search (srch)
  3  INDEXTYPE IS CTXSYS.CONTEXT
  4  PARAMETERS
  5    ('TRANSACTIONAL
  6  	 DATASTORE test_ds')
  7  /

Index created.

SCOTT@orcl12c> SET DEFINE OFF
SCOTT@orcl12c> INSERT ALL
  2  INTO blackboard_course_search VALUES
  3    ('SP2008 COMM-ST 312 0005 16565 ADVANCED PUBLIC SPEAKING', 'WASHINGTON GEORGE', NULL)
  4  INTO blackboard_course_search VALUES
  5    ('SP2008 COMM-ST 314WI 0001 16568 REPORTING', 'BUSH GEORGE', NULL)
  6  INTO blackboard_course_search VALUES
  7    ('SP2008 COMM-ST 317 0001 16569 PERSUASION', 'POE R', NULL)
  8  INTO blackboard_course_search VALUES
  9    ('SS2007 MATH', 'CROSS', NULL)
 10  INTO blackboard_course_search VALUES
 11    ('SS2007 MATH', 'SOMEBODY', NULL)
 12  INTO blackboard_course_search VALUES
 13    ('WHATEVER', 'CROSS', NULL)
 14  SELECT * FROM DUAL
 15  /

6 rows created.

SCOTT@orcl12c> COMMIT
  2  /

Commit complete.

SCOTT@orcl12c> VARIABLE words VARCHAR2(100)
SCOTT@orcl12c> COLUMN course_search	FORMAT A60 WORD_WRAPPED
SCOTT@orcl12c> COLUMN instructor_search FORMAT A20 WORD_WRAPPED
SCOTT@orcl12c> EXEC :words := 'SS2007 MATH CROSS'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> SELECT *
  2  FROM   (SELECT DENSE_RANK () OVER
  3  		      (ORDER BY SCORE(1) DESC,
  4  				GREATEST
  5  				  (UTL_MATCH.EDIT_DISTANCE_SIMILARITY
  6  				     (course_search, :words),
  7  				   UTL_MATCH.EDIT_DISTANCE_SIMILARITY
  8  				     (instructor_search, :words),
  9  				   UTL_MATCH.EDIT_DISTANCE_SIMILARITY
 10  				     (course_search || ' ' || instructor_search, :words),
 11  				   UTL_MATCH.EDIT_DISTANCE_SIMILARITY
 12  				     (instructor_search || ' ' || course_search, :words)) DESC)
 13  		      AS ranking,
 14  		    course_search,
 15  		    instructor_search
 16  	     FROM   blackboard_course_search
 17  	     WHERE  CONTAINS
 18  		      (srch,
 19  		       '?' || REPLACE (:words, ' ', '% ACCUM ?') || '%',
 20  		       1) > 0
 21  	     ORDER  BY ranking)
 22  WHERE  ROWNUM < 50
 23  /

   RANKING COURSE_SEARCH                                                INSTRUCTOR_SEARCH
---------- ------------------------------------------------------------ --------------------
         1 SS2007 MATH                                                  CROSS
         2 SS2007 MATH                                                  SOMEBODY
         3 WHATEVER                                                     CROSS

3 rows selected.

SCOTT@orcl12c> EXEC :words := 'GEORGE WASHNGTON'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING COURSE_SEARCH                                                INSTRUCTOR_SEARCH
---------- ------------------------------------------------------------ --------------------
         1 SP2008 COMM-ST 312 0005 16565 ADVANCED PUBLIC SPEAKING       WASHINGTON GEORGE
         2 SP2008 COMM-ST 314WI 0001 16568 REPORTING                    BUSH GEORGE

2 rows selected.

SCOTT@orcl12c> EXEC :words := '315 MATH WASHINGTON'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING COURSE_SEARCH                                                INSTRUCTOR_SEARCH
---------- ------------------------------------------------------------ --------------------
         1 SS2007 MATH                                                  SOMEBODY
         2 SP2008 COMM-ST 312 0005 16565 ADVANCED PUBLIC SPEAKING       WASHINGTON GEORGE
         3 SS2007 MATH                                                  CROSS

3 rows selected.

SCOTT@orcl12c> EXEC :words := 'HEMATOLOGY/ONCOLOGY'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

no rows selected

SCOTT@orcl12c> EXEC :words := 'SS2007 HEMATOOGY/ONCOLOGY BUSH G'

PL/SQL procedure successfully completed.

SCOTT@orcl12c> /

   RANKING COURSE_SEARCH                                                INSTRUCTOR_SEARCH
---------- ------------------------------------------------------------ --------------------
         1 SP2008 COMM-ST 314WI 0001 16568 REPORTING                    BUSH GEORGE
         2 SS2007 MATH                                                  CROSS
         2 SS2007 MATH                                                  SOMEBODY
         3 SP2008 COMM-ST 312 0005 16565 ADVANCED PUBLIC SPEAKING       WASHINGTON GEORGE

4 rows selected.

Re: Find Words in a String [message #619878 is a reply to message #619872] Fri, 25 July 2014 12:08 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Hi Barbara,

This is wonderful. Thank you.

Quick question. The index is being applied to the "srch" column?

When I was reading the Oracle Text docs I came about the multi-column index but didn't know how I could make it work with what you had already shown me (i.e. using CONTAINS (course_search.....)). So "srch" clears up that problem.

I was also applying this to my "course_search" (renamed the column from my very first post on this subject) column. I was just trying to apply techniques from what I was reading about Oracle Text.

Would a WORDLIST help any in this case?


begin
  ctx_ddl.create_preference ('text_search', 'BASIC_WORDLIST');
  ctx_ddl.set_attribute     ('text_search', 'substring_index', 'YES');
  ctx_ddl.set_attribute     ('text_search', 'prefix_index', 'YES');
  ctx_ddl.set_attribute     ('text_search', 'prefix_min_length', 1);
  ctx_ddl.set_attribute     ('text_search', 'prefix_max_length', 10);
end;

create index bk_course_search_ctxi on blackboard_course_search(course_search)
indextype is ctxsys.context
parameters('TRANSACTIONAL WORDLIST text_search')
noparallel;



I believe after this I won't bother you anymore.
Re: Find Words in a String [message #619897 is a reply to message #619878] Fri, 25 July 2014 15:20 Go to previous messageGo to next message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
Quote:

...Quick question. The index is being applied to the "srch" column?...


The index can be created on any single text column. What data is indexed depends on what columns are in the multi_column_datastore that is used in the index parameters. Instead of creating the index on any one of those columns, which you could do, it is commonplace to use a separate dummy column, perhaps with a name with a broader meaning, instead of one specific column. Whatever column you create the index on is the one that you will need to search on, remembering that it is actually searching the columns in the multi_column_datastore.

Quote:

Would a WORDLIST help any in this case?
...
begin
  ctx_ddl.create_preference ('text_search', 'BASIC_WORDLIST');
  ctx_ddl.set_attribute     ('text_search', 'substring_index', 'YES');
  ctx_ddl.set_attribute     ('text_search', 'prefix_index', 'YES');
  ctx_ddl.set_attribute     ('text_search', 'prefix_min_length', 1);
  ctx_ddl.set_attribute     ('text_search', 'prefix_max_length', 10);
end;
...

...


The purpose for a word list like the one you posted is for speeding up searches that use leading wildcards. If you are expecting wildcards, then you should also set your wildcard_maxterms appropriately.


Re: Find Words in a String [message #619901 is a reply to message #619897] Fri, 25 July 2014 15:59 Go to previous messageGo to next message
Duane
Messages: 452
Registered: December 2002
Senior Member
Gotcha!

That wasn't very clear in the docs or I just missed that part when I was reading. I'm also trying to work on the application and read the docs while working.

Ah, you're talking about something like "wom?n", "edit* content" or work% within the actual user's text and not the "?" or "%" within the CONTAINS statement. I was thinking you had to do that if the CONTAINS had those characters. Silly me.

CONTAINS (srch, '?' || REPLACE (:words, ' ', '% ACCUM ?') || '%', 1) > 0


Thank you for all these queries you have given me. All this helps and will help me build on these concepts.
Re: Find Words in a String [message #619909 is a reply to message #619901] Fri, 25 July 2014 19:46 Go to previous message
Barbara Boehmer
Messages: 8751
Registered: November 2002
Location: California, USA
Senior Member
The only valid wildcard in contains clause using a context index is %. You can have a leading wildcard, like %word or a trailing wildcard, like word% or both, like %word%. Whether you put wildcards in the words variable or in the contains clause they end up in the contains clause. If you have a contains clause like:

CONTAINS (srch, '?' || REPLACE (:words, ' ', '% ACCUM ?') || '%', 1) > 0

and the user enters the value word1 word2 word3 for the :words variable, then you end up with:

CONTAINS (srch, ?word1% ACCUM ?word2% ACCUM ?word3%', 1) > 0

It automatically adds searching for similarly spelled words and trailing wildcards (like auto complete) to every word and adds ACCUM between every word, so that it returns any rows with any of the terms, with the rows that have more of the individual terms scoring higher. It is up to you whether you want to do this automatically for your users or allow your users to enter such things on their own. It sounded like you wanted to make it a simple, google-like entry for your users and do the rest automatically, so that is why I suggested that.

If you are expecting that users may enter ? and * and such in invalid places in the words variable, then you will want to strip those out, perhaps nesting an additional replace:

CONTAINS (srch, '?' || REPLACE (REPLACE (REPLACE (:words, '?', ''), '*', ''), ' ', '% ACCUM ?') || '%', 1) > 0




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