Web Reference: The SQL UNION ALL operator combines the result sets of two or more SELECT statements into a single result set. It is similar to the UNION operator, but it does not remove duplicate rows from the result set. The SQL UNION ALL Operator The UNION ALL operator is used to combine the result-set of two or more SELECT statements. The UNION ALL operator includes all rows from each statement, including any duplicates. Requirements for UNION ALL: Every SELECT statement within UNION ALL must have the same number of columns The columns must also have similar data types The columns in every SELECT statement ... The UNION and UNION ALL operators in SQL Server are used to combine the result-set of two or more SELECT statements into a single result set. Let us understand UNION and UNION ALL Operators with some examples.
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