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It means the number of columns you select in the top query must be the same as the number of columns in the second. If you don't have the same number, you can work around it. Below I can add a NULL to the second query because it's missing a third column. SELECT col1,col2,col3 FROM t1 UNION ALL SELECT col1,col2, NULL FROM t2


Have you tried this? SELECT Id, StatusDate, [ some way to select columns from appropiate table depending on result.tbl ] FROM ( SELECT Id, StatusDate, 'Results_201505' as tbl FROM Results_201505 WHERE A = 0, B = 1, C = 3 UNION ALL SELECT Id, StatusDate, 'Results_201504' as tbl FROM Results_201504 WHERE A ...

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