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Thread: subtracting two diff columns
Dec 9, 2008, 05:41 #1
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- May 2008
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subtracting two diff columns
I am confused how to do this.
I have two tables and each table has an "Amount" colum.
I need to sum up all the rows for column "Amount" in table A and sum up all the rows for column "Amount" in table B
and then subtract those two colums.
Here is what I am doing:
select tableA.city, sum(tableA.amount) - sum(tableB.amount) from tableB,tableA where tableB.city='Hyderabad' and tableB.city=tableA.city group by tableB.city
Say: tableA Has the following data for column "Amount" and city=Hyderabad:
111 5 10
AND tableB Has the following data for column "Amount" and city=Hyderabad:
Now, my above query should do the following:
Sum all amounts for tableA, which comes to 126
Sum all amounts for tableB, which comes to 11
So 126 - 11 = 115
But I get the result 219
Any idea wots going on and how to fix it?