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sql subtract subquery sum multiple tables

How can I subtract the sum of a subquery table from another table?

SELECT i.column1 * i.column2 AS Expr1

    , i.column1 * i.column2 - (SELECT SUM(table2.column1) AS Expr1
                               FROM table2
                               WHERE (table2.column3 = table1.column3)) AS derivedExpression
FROM table1


Only the derivedExpression in the first row is correct. The rest rows returns null for derivedExpression. For Expr1, everything is fine. Any help?

Last updated:9/28/2013 8:58:52 AM

1 Answers

Ida B Wells
Ida B Wells

SELECT i.column1 * i.column2 AS Expr1

    , i.column1 * i.column2 - (SELECT COALESCE(SUM(table2.column1), 0) AS Expr1
                               FROM table2
                               WHERE (table2.column3 = table1.column3)) AS derivedExpression
FROM table1



Last updated:9/28/2013 8:58:52 AM

Answer