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Re: Using UNION to add selected field in multiple select statements?
Posted by: Muhammad Omair
Date: February 02, 2016 08:15AM

The below query will add the first two values and subtract the next two. You can replace each sample SQL with your required SQL query.
SELECT sum(col1) + sum(col2) AS addition, sum(col3) - sum(col4) AS subtract FROM (SELECT 1 as col1, 0 AS col2, 0 AS col3, 0 AS col4 UNION ALL SELECT 0 AS col1, 2 AS col2, 0 AS col3, 0 AS col4 UNION ALL SELECT 0 AS col1, 0 AS col2, 3 AS col3, 0 AS col4 UNION ALL SELECT 0 AS col1, 0 AS col2, 0 AS col3, 4 AS col4 ) sub;

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Re: Using UNION to add selected field in multiple select statements?
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February 02, 2016 08:15AM


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