If you add an invalid value to ENUM columns, an empty string ("") is inserted instead
mysql>
mysql> CREATE TABLE test6(bool ENUM("true","false"));
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> INSERT INTO test6(bool) VALUES ('true');
Query OK, 1 row affected (0.00 sec)
mysql>
mysql> INSERT INTO test6(bool) VALUES ('troo');
Query OK, 1 row affected, 1 warning (0.00 sec)
mysql>
mysql> SELECT bool from test6;
+------+
| bool |
+------+
| true |
| |
+------+
2 rows in set (0.00 sec)
mysql>
mysql> drop table test6;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
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