ALTER TABLE `table_name`
add M1 smallint(6) DEFAULT NULL,
add M2 smallint(6) DEFAULT NULL,
add M3 smallint(6) DEFAULT NULL;
转载于:https://www.cnblogs.com/lingxzg/archive/2010/10/22/1858396.html
转载于:https://www.cnblogs.com/lingxzg/archive/2010/10/22/1858396.html