sql subtract subquery sum multiple tables

Andrew Deniel 4088 28 Sep 2013

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?

1 Answers

Anonymous User 28 Sep 2013

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

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sql subtract subquery sum multiple tables

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