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TRUE FALSE

Description

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

Examples

SELECT TRUE, true, FALSE, false;
+------+------+-------+-------+
| TRUE | TRUE | FALSE | FALSE |
+------+------+-------+-------+
|    1 |    1 |     0 |     0 |
+------+------+-------+-------+
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https://mariadb.com/kb/en/true-false/