Web Reference: This tutorial shows you how to use the SQL Server UNION to combines rows from two or more queries into a single result. Nov 18, 2025 · The following examples use UNION to combine the results of the same table to demonstrate the effects of ALL and parentheses when using UNION. The first example uses UNION ALL to show duplicated records and returns each row in the source table three times. The UNION operator is used to combine the result-set of two or more SELECT statements. The UNION operator automatically removes duplicate rows from the result set.
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