CARTESIAN PRODUCT problem

Question

hello,
i m trying to find the difference for calculating the DIFFENCE IN STOCK FOR OPC,PPC,CLINKER BY USING FOLLOWING SQL-QUERY
SELECT TO_CHAR(a.dateofmtrl,'YYYY') YEAR,
SUM(a.rm1) - SUM(b.rm1) - SUM(c.rm1) OPC,
SUM(a.rm2) - SUM(b.rm2) - sum(c.rm2) PPC,
SUM(a.rm3) - SUM(b.rm3) - sum(c.rm3) CLINKER
FROM rawmtrl_graph a
INNER JOIN rawmtrl_graph b ON TO_CHAR(a.dateofmtrl,'YYYY') =TO_CHAR(B.dateofmtrl,'YYYY')
INNER JOIN rawmtrl_graph c ON TO_CHAR(a.dateofmtrl,'YYYY') =TO_CHAR(C.dateofmtrl,'YYYY')
WHERE a.mtrl_flag='P'
AND b.mtrl_flag='D'
AND c.mtrl_flag='CS'
GROUP BY TO_CHAR(a.dateofmtrl,'YYYY')
BUT IT IS GIVING CARTESIAN PRODUCT...
HOW TO MODIFY THE QUERY FOR FINDING EXACT FIGURE??????
THANKS IN ADVENCE FOR ANY HELP.....

Answer 1

Hi,
please always put your code between two lines starting with {noformat}{noformat}.
Additionally when you put insert statement put them entirely and not copying from one table we don't have.
Here the way to get the result you want:SELECT EXTRACT(YEAR FROM dateofmtrl) yr
, SUM(CASE mtrl_flag WHEN 'P' THEN rm1 ELSE -rm1 END) AS opc
, SUM(CASE mtrl_flag WHEN 'P' THEN rm2 ELSE -rm2 END) AS ppc
, SUM(CASE mtrl_flag WHEN 'P' THEN rm3 ELSE -rm3 END) AS clinker
FROM rawmtrlgraph
GROUP BY EXTRACT(YEAR FROM dateofmtrl);
YR OPC PPC CLINKER
2011 50 54 55
2012 -49 -3 -11
Regards.
Al