How to use minus ?

Question

Hi Everyone,
My issue,
1)select count(1) from ((select * from udm_po_headers_r) --9783387
minus
((select * from nzprod..udm_po_headers_r po_headers
where po_headers.source_id = 1 and po_headers.org_id in (84,316,356,414,874,894,1074,1214,1234,1314,1754,1774,1934,2594,2734,2994,3014,3374,3996,4356,4416,4516,4576,715))
union all
(select * from nzprod..udm_po_headers_r po_headers--9783054
where po_headers.source_id = 3 and po_headers.org_id =715)))c
2)select * from udm_po_headers_r it has 9783387 records
3)select * from nzprod..udm_po_headers_r po_headers
where po_headers.source_id = 1 and po_headers.org_id in (84,316,356,414,874,894,1074,1214,1234,1314,1754,1774,1934,2594,2734,2994,3014,3374,3996,4356,4416,4516,4576,715))
union all
(select * from nzprod..udm_po_headers_r po_headers
where po_headers.source_id = 3 and po_headers.org_id =715 it has --9783054 records
if we minus both the record count, the difference is 333. Now, i want to retrieve that 333 records using minus function.
if i use the step 1: am getting record count has 9783387 instead of 333.
Can anyone please help me in these issue.it might be a grateful.
Regards,
Madhusudhanan

Answer 1

Hi, Madhusudhanan,
Rather than doing UNION and/or MINUS operations involving the same table, it will be more efficient just to do a simple query, with a WHERE clause that gets just the rows you want.
It's very hard to tell without some sample data, but I think what you want is:
SELECT     *
FROM     udm_po_headers
WHERE     (    source_id     != 1
     OR   ordg_id     NOT IN (   84,  316,  356,  414,  874
                      ,  894, 1074, 1214, 1234, 1314
                      , 1754, 1774, 1934, 2594, 2734
                      , 2994, 3014, 3374, 3996, 4356
                      , 4416, 4516, 4576,  715
AND     (    source_id != 3
     OR   org_id    != 715
;I hope this answers your question.
If not, post a little sample data (considerably less than 9783387; maybe 10 rows). Post CREATE TABLE and INSERT statements for the sample data, and the results you want from that data.