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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Tricky query question
How could you say that ? ):
No offense at all, I saw Larry post.
I liked to be able to do it without using the analytic functions (Oracle 7.0 for example).
Also was wondering about a way to define data buckets using basic relational methods.
Regards,
Waleed
-----Original Message-----
Sent: Friday, January 24, 2003 7:48 PM
To: ORACLE-L_at_fatcity.com
Cc: Waleed.Khedr_at_FMR.COM
Importance: High
No offense Waleed, but the solution Larry suggested is quite a bit easier to take. :)
SQL> l
1 select primarykey,
2 status, 3 dateinserted, 4 LAG(status,1) OVER (PARTITION BY primarykey 5 ORDER BY dateinserted) prior_status6* from tricky
Jared
"Khedr, Waleed" <Waleed.Khedr_at_FMR.COM>
Sent by: root_at_fatcity.com
01/24/2003 02:40 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: RE: Tricky query question
This works :
create table test_event ( mypk number , mystatus char , mydate date));
insert into test_event values ( 1 , 'A',
to_date('01/01/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'A',
to_date('01/02/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'B',
to_date('01/03/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'B',
to_date('01/04/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'C',
to_date('01/05/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'C',
to_date('01/06/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'A',
to_date('01/07/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'A',
to_date('01/08/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'D',
to_date('01/09/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'D',
to_date('01/11/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'D',
to_date('01/21/2001','mm/dd/yyyy'));
insert into test_event values ( 1 , 'B',
to_date('01/22/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'F',
to_date('01/01/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'F',
to_date('01/02/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'A',
to_date('01/03/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'A',
to_date('01/04/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'A',
to_date('01/05/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'F',
to_date('01/06/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'R',
to_date('01/07/2001','mm/dd/yyyy'));
insert into test_event values ( 2 , 'T',
to_date('01/08/2001','mm/dd/yyyy'));
insert into test_event values ( 3 , 'Y',
to_date('01/09/2001','mm/dd/yyyy'));
insert into test_event values ( 3 , 'Y',
to_date('01/11/2001','mm/dd/yyyy'));
insert into test_event values ( 3 , 'Y',
to_date('01/21/2001','mm/dd/yyyy'));
insert into test_event values ( 3 , 'Z',
to_date('01/22/2001','mm/dd/yyyy'));
commit;
select a.mypk,b.mydate,b.mystatus
from
(select rownum myseq,mypk,mystatus,mydate
from (select mypk,mystatus,mydate
from test_event
order by mypk,mydate)) a,
from test_event
order by mypk,mydate)) b
where a.mypk = b.mypk
MYPK MYDATE MYSTATUS 1 1/3/2001 12:00:00 AM B 1 1/5/2001 12:00:00 AM C 1 1/7/2001 12:00:00 AM A 1 1/9/2001 12:00:00 AM D 1 1/22/2001 12:00:00 AM B 2 1/3/2001 12:00:00 AM A 2 1/6/2001 12:00:00 AM F 2 1/7/2001 12:00:00 AM R 2 1/8/2001 12:00:00 AM T 3 1/22/2001 12:00:00 AM Z
Regards,
Waleed
-----Original Message-----
Sent: Thursday, January 23, 2003 10:04 PM
To: Multiple recipients of list ORACLE-L
Hi All,
This is a question for those who like writing tricky queries as a single
SQL...
Assume I have a table with the following structure (imaginary table to
keep
example simple):
primarykey number(8)
status char(1)
dateinserted date
<many other fields which are insignificant>
A row is inserted into this table any time one, or more, fields change for the record. What I'm trying to determine is the "dateinserted" for each time the value of "status" changed - remembering that there might be 50 records for the primary key and five of those include a change in status - I want the dates of those five records (plus the value of status at each date).
Is there any way to achieve this within a single SQL statement? I realise
that I could cursor through each record in date order and use a variable
to
store the previous value of status - but I'd love to compress this to a
single statement. I've seen the syntax "OVER" used in some queries and
suspect this may be useful but I really don't understand it enough to
know.
Thanks in advance if you can help me on this one,
Mark.
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mark Richard INET: mrichard_at_transurban.com.au Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Khedr, Waleed INET: Waleed.Khedr_at_FMR.COM Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Khedr, Waleed INET: Waleed.Khedr_at_FMR.COM Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Jan 24 2003 - 23:28:46 CST
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