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MySQL 8.0 Reference Manual  /  ...  /  Boolean Literals

Pre-General Availability Draft: 2018-02-21

9.1.6 Boolean Literals

The constants TRUE and FALSE evaluate to 1 and 0, respectively. The constant names can be written in any lettercase.

mysql> SELECT TRUE, true, FALSE, false;
        -> 1, 1, 0, 0

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