Generate calendar from data

Question

Hi all, i have a problem with a query. i will make this two parts. the first part is describe below. the second part will be discuss in follow up posts. i am using oracle 9.2.0.7 enterprise
i have two tables
CREATE TABLE t2 (id NUMBER, dt DATE, src NUMBER);
ALTER TABLE t2 ADD PRIMARY KEY(id,dt,src);
CREATE TABLE year_calendar(id NUMBER, dt DATE);
ALTER TABLE year_calendar ADD primary_key(id,dt)
and i have data on them. you can download the files from this link and loaded using sql loader
http://lavainita.webatu.com/files/flat/Downloads.zip
note: t2 has 185,000 rows data looking a the file. but if you would like you can duplicate the data so that it reaches 1.5 million
but the duplication should have different src number. i am interested in 59
the problem is that i am trying to generate a calendar (kind of)
year_calendar has dates on them. i am interesting on the dates for id 42
t2 table has dates that are one week apart and sometimes month end dates.
for example, for id 557267 and src=59 i have data such as
557267 1/27/2009
557267 2/3/2009
557267 3/3/2009
557267 3/31/2009
and so on
what i want to do is join t2 with year_calendar and generate some sort of calendar. so for example, the output should be something like
557267 1/27/2009
557267 1/28/2009 --taken from calendar table
557267 1/29/2009 -- same as above
....so on
557267 2/3/2009
557267 2/4/2009
... so on
i have the following query that does this but it is running kind of slow. takes a few minutes to complete
WITH t1 AS (
SELECT     id, dt
     ,     LEAD (dt, 1, dt+1) )
          OVER ( PARTITION BY id ORDER BY dt)          AS next_dt
     FROM     t2 WHERE src=59
SELECT b.dt,
ratings2.id
     FROM     (SELECT * FROM t1)ratings2 ,year_calendar b
WHERE b.dt >= ratings2.dt
          AND     b.dt < ratings2.next_dt
AND b.id=42
does anybody know how to tune this query or create another query that does the same thing(join t2 with year_calendar and generate a calendar) please note: id in year calendar is not related to id in t2. they mean different thing
Edited by: user12852540 on Apr 1, 2010 11:10 AM

Answer 1

Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('01/27/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('01/28/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('01/29/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('01/30/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('01/31/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/01/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/02/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/03/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/04/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/05/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/06/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/07/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into year_calendar
(id, dt)
Values
(42, TO_DATE('02/08/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into t2
(id, dt, src)
Values
(557267, TO_DATE('01/27/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), 59);
Insert into t2
(id, dt, src)
Values
(557267, TO_DATE('02/03/2009 00:00:00', 'MM/DD/YYYY HH24:MI:SS'), 59);
output should be
557267 1/27/2009
557267 1/28/2009
557267 1/29/2009
557267 1/30/2009
557267 1/31/2009
557267 2/1/2009
557267 2/2/2009
557267 2/3/2009
of course, any query will run fast with this amount of data. if you load the file i provided and run query on it, then you will see that it runs slower. query should give the output above