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1,创建触发器:t_afterinsert_on_tab1
作用:增加tab1表记录后自动将记录增加到tab2表中
CREATE TRIGGER t_afterinsert_on_tab1
AFTER INSERT ON tab1
FOR EACH ROW
BEGIN
if new.tab1_id is not null then
insert into tab2(tab2_id) values(new.tab1_id);
end if;
END;
2,创建触发器:t_afterdelete_on_tab1
作用:删除tab1表记录后自动将tab2表中对应的记录删去
CREATE TRIGGER t_afterdelete_on_tab1
AFTER DELETE ON tab1
FOR EACH ROW
BEGIN
delete from tab2 where tab2_id=old.tab1_id;
END;
2,创建触发器:t_afterupdate_on_a
作用:修改a表age字段后自动将b表中对应的age字段修改
CREATE TRIGGER t_afterupdate_on_a
AFTER UPDATE ON a
FOR EACH ROW
update b set age=NEW.age where id=NEW.id;