Re: Date range view

From: Maxim Demenko <mdemenko_at_gmail.com>
Date: Fri, 14 Nov 2008 19:53:17 +0100
Message-ID: <gfkhes$qcf$03$1@news.t-online.com>


Michel Cadot schrieb:

> <dleland3_at_gmail.com> a écrit dans le message de news: 6690ecf1-7f0d-4ca0-bb14-f445eee2cb82_at_l33g2000pri.googlegroups.com...

> |I am currently using Oracle 9i and have created a table:
> |
> | CREATE TABLE FSR_TECH
> | (
> | ID VARCHAR2(20),
> | TECHNICIAN VARCHAR2(20),
> | FROM_DATE DATE,
> | THRU_DATE DATE
> | )
> |
> | I have inserted the following data into it:
> |
> | INSERT INTO FSR_TECH VALUES('FSR0000001','JIM.POULSEN','30-
> | SEP-2008','01-OCT-2008');
> | INSERT INTO FSR_TECH VALUES('FSR0000002','DAVE.ROSE','13-OCT-2008','13-
> | OCT-2008');
> | INSERT INTO FSR_TECH VALUES('FSR0000002', 'LLOYD.MEHANEY', '13-
> | OCT-2008', '13-OCT-2008');
> | INSERT INTO FSR_TECH VALUES('FSR0000003', 'DAVE.ROSE', '06-OCT-2008',
> | '13-OCT-2008');
> | COMMIT;
> |
> | ID TECHNICIAN FROM_DATE THRU_DATE
> | ---------- -------------------- ---------- ----------
> | FSR0000001 JIM.POULSEN 2008-09-30 2008-10-01
> | FSR0000002 DAVE.ROSE 2008-10-13 2008-10-13
> | FSR0000002 LLOYD.MEHANEY 2008-10-13 2008-10-13
> | FSR0000003 DAVE.ROSE 2008-10-06 2008-10-13
> |
> | I would like to create a view over it by including all dates between
> | the from and thru dates
> | (inclusive) and have it presented as follows:
> |
> | TECHNICIAN DATE
> | ------------- ----------
> | JIM.POULSEN 2008-09-30
> | JIM.POULSEN 2008-10-01
> | DAVE.ROSE 2008-10-13
> | LLOYD.MEHANEY 2008-10-13
> | DAVE.ROSE 2008-10-06
> | DAVE.ROSE 2008-10-07
> | DAVE.ROSE 2008-10-08
> | DAVE.ROSE 2008-10-09
> | DAVE.ROSE 2008-10-10
> | DAVE.ROSE 2008-10-11
> | DAVE.ROSE 2008-10-12
> | DAVE.ROSE 2008-10-13
> |
> | I have tried numerous things (CONNECT BY, LEVEL, PARTITION) but just
> | cannot come up with a way of doing it. Any ideas?
> |
> | Dave
> 
> 
> SQL> with
>   2    minmax as (
>   3      select min(from_date) mindate, max(thru_date) maxdate
>   4      from fsr_tech
>   5    ),
>   6    cal as (
>   7      select mindate+level-1 mydate
>   8      from minmax
>   9      connect by level <= maxdate-mindate+1
>  10    )
>  11  select id, technician, mydate
>  12  from fsr_tech partition by (id, technician)
>  13       left outer join cal
>  14       on (mydate between from_date and thru_date)
>  15  order by 1,3
>  16  /
> ID                   TECHNICIAN           MYDATE
> -------------------- -------------------- -----------
> FSR0000001           JIM.POULSEN          30-SEP-2008
> FSR0000001           JIM.POULSEN          01-OCT-2008
> FSR0000002           DAVE.ROSE            13-OCT-2008
> FSR0000002           LLOYD.MEHANEY        13-OCT-2008
> FSR0000003           DAVE.ROSE            06-OCT-2008
> FSR0000003           DAVE.ROSE            07-OCT-2008
> FSR0000003           DAVE.ROSE            08-OCT-2008
> FSR0000003           DAVE.ROSE            09-OCT-2008
> FSR0000003           DAVE.ROSE            10-OCT-2008
> FSR0000003           DAVE.ROSE            11-OCT-2008
> FSR0000003           DAVE.ROSE            12-OCT-2008
> FSR0000003           DAVE.ROSE            13-OCT-2008
> 
> 12 rows selected.
> 
> Regards
> Michel
> 
> 

Michel, iirc , partition join doesn't work on 9i, but it can be safely left out in this case as well.
Alternatively, one hierarchical query should be sufficient as well

SQL> select id,technician,from_date + level - 1 mydate

   2 from fsr_tech t
   3 connect by prior id=id
   4 and prior technician=technician
   5 and prior from_date + level -1 <= thru_date    6 and prior dbms_random.value is not null    7 ;

ID                   TECHNICIAN           MYDATE
-------------------- -------------------- ----------
FSR0000001           JIM.POULSEN          2008-09-30
FSR0000001           JIM.POULSEN          2008-10-01
FSR0000002           DAVE.ROSE            2008-10-13
FSR0000002           LLOYD.MEHANEY        2008-10-13
FSR0000003           DAVE.ROSE            2008-10-06
FSR0000003           DAVE.ROSE            2008-10-07
FSR0000003           DAVE.ROSE            2008-10-08
FSR0000003           DAVE.ROSE            2008-10-09
FSR0000003           DAVE.ROSE            2008-10-10
FSR0000003           DAVE.ROSE            2008-10-11
FSR0000003           DAVE.ROSE            2008-10-12
FSR0000003           DAVE.ROSE            2008-10-13

12 rows selected.

Best regards

Maxim Received on Fri Nov 14 2008 - 12:53:17 CST

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