How to Combine two queries into One

Question

Hi Gurus,
SQL> select * from v$version;
BANNER
Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL>
I have following two queries. How I can convert these two queries into one with the same result ?
Q1
SELECT id,vdate,vendorname,venddate,vid
FROM VENDOR
WHERE processid=32
AND venddate is null
AND vid in(select vid from view_vid where type='PDX')
AND (id,vdate) not in (select id,vdate from vkfl_is where task_id=55)
AND (id,vdate) in (select id,vidate from market_data where marketed_date is null)
AND id not in (select id from location)
Q2
SELECT id,vdate,vendorname,venddate,vid
FROM VENDOR
WHERE processid=20
AND venddate is null
AND vid in(select vid from view_vid where type='PBX')
AND (id,vdate) not in (select id,vdate from vkfl_is where task_id=40)
AND (id,vdate) in (select id,vidate from market_data where region_date is null)
AND id not in (select id from location)
I can UNION these two queries, but, is there any way I can write a single query with which gives me same result as above two queries?
Any help would be highly appreciated
Thanks in advance

Answer 1

Hi,
You can do something like this, which will be more efficient than a UNION:
SELECT  id, vdate, vendorname, venddate, vid
FROM  vendor
WHERE  (   (    -- Conditions that apply only to q1
                           processid = 32
            AND  vid       IN (SELECT vid FROM view_vid WHERE type = 'PDX')
            AND (id,vdate) NOT IN ( SELECT id, vdate
                                    FROM   vkfl_is
                                    WHERE  task_id = 55
            AND (id,vdate) IN ( SELECT id, vidate
                                FROM   market_data
                                WHERE  marketed_date IS NULL
        OR  (  -- Conditions that apply only to q2
                 processid = 20
            AND  vid       IN (SELECT vid FROM view_vid WHERE type = 'PBX')
            AND (id,vdate) NOT IN ( SELECT id, vdate
                                    FROM   vkfl_is
                                    WHERE  task_id = 40
            AND (id,vdate) IN ( SELECT  id, vidate
                                FROM  market_data
                                WHERE  region_date IS NULL
               -- The remaining conditions apply to both q1 and q2
AND     venddate   IS NULL
AND     id         NOT IN (SELECT id FROM location)
I hope this answers your question.
If not, post  a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Explain, using specific examples, how you get those results from that data.
See the forum FAQ: https://forums.oracle.com/message/9362002