Summary of commonly used sql in MYSQL

MySQL adds a new field after the specified field

ALTER TABLE um_sys_dept ADD dept_grade VARCHAR(4)   COMMENT "公司的等级，用于做权限控制" AFTER dept_code;

ALTER TABLE single_car_list ADD current_dir VARCHAR(30)   COMMENT "核验时创建的时间戳目录" AFTER parent_id;

ALTER TABLE single_car_list ADD show_admin VARCHAR(30)   COMMENT "admin的编辑按钮控制" AFTER reviser;

ALTER TABLE single_car_list ADD show_update VARCHAR(30)   COMMENT "总公司的编辑按钮控制" AFTER reviser;


alter table single_car_list modify column report_no varchar(50);

alter table single_car_list modify column event_pass varchar(500);

alter table single_car_list modify column check_direction varchar(500);

ALTER TABLE fixed_loss_amount ADD dept_no VARCHAR(20)   COMMENT "分公司的控制按钮" AFTER reviser;

ALTER TABLE fixed_loss_amount ADD dept_code VARCHAR(20)   COMMENT "总公司的控制按钮" AFTER dept_no;