Boolean Literals
Boolean Literals
常量 TRUE 和 FALSE 等于 1 和 0，它是大小写不敏感的。
mysql> SELECT TRUE, true, tRuE, FALSE, FaLsE, false;
+------+------+------+-------+-------+-------+
| TRUE | true | tRuE | FALSE | FaLsE | false |
+------+------+------+-------+-------+-------+
| 1 | 1 | 1 | 0 | 0 | 0 |
+------+------+------+-------+-------+-------+
1 row in set (0.00 sec)