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SQL Union Vs Union ALL

Umasankar Natarajan

06/06/2017 0 0

SQL UNION vs UNION ALL Operator Usage

UNION:

UNION combines the result set of two or more queries into a single result set. UNION removes duplicate records (where all columns in the results are the same).

UNION ALL:

UNION combines the result set of two or more queries into a single result set. UNION ALL does not remove duplicate records.

Important points:

The following points need to be considered when using the UNION or UNION ALL operator:

The number of columns and sequence of columns must be the same in all queries
The data types must be compatible.

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