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9.1.4 Boolean Values
--------------------
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
情報カタログ
(mysql.info) hexadecimal-values
(mysql.info) literals
(mysql.info) bit-field-values