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sql statement help !!

1
id c1 c2 c3 c4
1 a 0 100 0
2 b 0 200 0
3 a 1 50 0
4 a 1 0 50
5 b 2 199 0
6 c 0 300 0

c1 store name
c2 store field of id
c3 store original qty and reused qty
c4 store wasted

aim : want to calculate how many qty remain(i.e a=0, b=1, c=300)
sql statement:
select sum(c3) from table as a where c3>(select sum(c3) from table where
a.id=c2 group by c2)+select sum(c4) from table a.id=c2 group by c2) where
c2=0 group by c1

is there any problem in my statement,
it is now only result b=200 ??
Sep 7 '06 #1
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