Re: Help with Query

From: Jeff B <jeffby_at_KnoSpam.tds.net>
Date: Sun, 25 Nov 2007 15:59:09 GMT
Message-ID: <hZg2j.40494$G23.32777@newsreading01.news.tds.net>

"Charles Hooper" <hooperc2000_at_yahoo.com> wrote in message news:4ed69188-f428-46dd-86f0-8850efb9faa9_at_n20g2000hsh.googlegroups.com...
> On Nov 25, 9:52 am, "Jeff B" <jef..._at_KnoSpam.tds.net> wrote:
>> Hi everyone,
>>
>> I have a book table and in that table it has the book tile, publisher,
>> and
>> type of book it is. example mystery, scifi, etc...
>>
>> I am trying to write a query that brings back a list of every pair of
>> books
>> that have the same publisher and same book type. I have been able to get
>> the following code to work:
>>
>> select publisher_code, type
>> from book
>> group by publisher_code, type
>> having count(*) > 1;
>>
>> which returns the following results:
>>
>> PU TYP
>> -- ---
>> JP MYS
>> LB FIC
>> PE FIC
>> PL FIC
>> ST SFI
>> VB FIC
>>
>> I can not figure out how to get the book title and book code for the
>> books
>> that this result list represents, everything i have tried throws out an
>> error.
>>
>> Can someone help?
>>
>> Thanks,
>>
>> Jeff
>
> I see two possible methods:
> 1. Slide the SQL statement that you have written into an inline view,
> join the inline view to your book table, and then use the
> publisher_code, type columns to drive back into your book table. The
> join syntax may look like one of the following: (publisher_code, type)
> IN (SELECT...) or b.publisher_code=ib.publisher_code and
> b.type=ib.type
> 2. Use analytical functions (COUNT() OVER...) to determine the number
> of matches for the same publisher_code, type columns. Then slide this
> SQL statement into an inline view to retrieve only those records with
> the aliased COUNT() OVER greater than 1. This has the benefit of
> retrieving the matching rows in a single pass.
>
> You will likely find examples of the above approaches in this and the
> comp.databases.oracle.server group.
>
> Charles Hooper
> IT Manager/Oracle DBA
> K&M Machine-Fabricating, Inc.

Hi Charles,

Thanks for the response. I can not say that I understand everything that you were saying. When you say inline view do you mean like this?

select title
from book
where publisher_code and type in
(select publisher_code, type
from book
group by publisher_code, type
having count(*) > 1);

this did not work it threw back the following error:

SQL> select title
  2 from book
  3 where type in
  4 (select publisher_code, type
  5 from book
  6 group by publisher_code, type
  7 having count(*) > 1);
(select publisher_code, type
 *
ERROR at line 4:
ORA-00913: too many values

SQL> select title
  2 from book
  3 where publisher_code, type in
  4 (select publisher_code, type
  5 from book
  6 group by publisher_code, type
  7 having count(*) > 1);
where publisher_code, type in

                    *

ERROR at line 3:
ORA-00920: invalid relational operator

SQL> select title
  2 from book
  3 where publisher_code and type in
  4 (select publisher_code, type
  5 from book
  6 group by publisher_code, type
  7 having count(*) > 1);
where publisher_code and type in

                     *

ERROR at line 3:
ORA-00920: invalid relational operator

is this what you were referring too? still not being able to get it. I am thinking that i have to be half way to the solution with the first part that did bring back the six sets, just cannot figure out how to get the book code and titles for each of those six sets?

Again thanks for the help

Jeff Received on Sun Nov 25 2007 - 09:59:09 CST