MySQLのDATETIME型で秒の小数部を扱うときのDEFAULT句

mysql57> CREATE TABLE t1 (num INT UNSIGNED NOT NULL, dt DATETIME(3) DEFAULT CURRENT_TIMESTAMP); ERROR 1067 (42000): Invalid default value for 'dt' mysql57> CREATE TABLE t1 (num INT UNSIGNED NOT NULL, dt DATETIME(3) DEFAULT CURRENT_TIMESTAMP(3)); Query OK, 0 rows affected (0.01 sec) mysql57> SHOW CREATE TABLE t1\G *************************** 1. row *************************** Table: t1 Create Table