The Ultimate Guide to High Availability with MariaDB

Boolean Literals

In MariaDB, FALSE is a synonym of 0 and TRUE is a synonym of 1. These constants are case insensitive, so TRUE, True, and true are equivalent.

These terms are not synonyms of 0 and 1 when used with the IS operator. So, for example, 10 IS TRUE returns 1, while 10 = TRUE returns 0 (because 1 != 10).

The IS operator accepts a third constant exists: UNKNOWN. It is always a synonym of NULL.

TRUE and FALSE are reserved words, while UNKNOWN is not.

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