關於在SQL中使用觸發器是怎麼將另外一個查詢結果做爲一條插入語句的值

觸發器：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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