mysql添加字段語句

1.添加 varchar類型的字段：

alter table b_warehouse_message add column entity_warehouse_no_test varchar(48) CHARACTER SET utf8 COLLATE utf8_general_ci COMMENT '實體倉庫代碼';

alter table b_warehouse_message change entity_warehouse_no_test entity_warehouse_no11 varchar(48) ;

ALTER TABLE b_warehouse_message DROP entity_warehouse_no_test;