关于在SQL中使用触发器是怎么将另外一个查询结果做为一条插入语句的值

触发器：web create trigger Pj_trigger before update on pjxt_majorcourseinfo for each row begin declare zy varchar(20); set zy=old.ZYMC; if old.PJ=0 AND new.PJ=1 then insert into pjx

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