MYSQL TRIGGER子查詢更新

Question

我是新與我的SQL的工作，我開發一個觸發器在SQLSERVER運行完美，現在我想將它轉換，在MySQL中使用，但不工作，我不不知道該怎麼做。

下面的代碼：

CREATE TRIGGER tg_test AFTER UPDATE ON YET FOR EACH ROW 

INSERT INTO CONTROLETRIGGER(idAluno, idNivel) 
values(NEW.IdAluno, NEW.idNivel); 


UPDATE HistoricoNivel AS E 
join(
select max(h.idNivel) Nivel, h.idAluno 
from HistoricoNivel h 
join CONTROLETRIGGER v on h.idaluno = v.idaluno 
WHERE h.dtFim is null 
group by h.idAluno 
)X on E.idAluno = X.idAluno and E.idNivel= X.Nivel 
join CONTROLETRIGGER vi on vi.idaluno = E.idAluno 
set E.dtFim = case when X.idnivel <> vi.idNivel then CURRENT_DATE() else null end 

請，我在做什麼錯？

Tks。

Answer 1

X子查詢沒有字段idnivel，所以case語句不會編譯。

我假設你想要的這裏是nivel，這將使充分觸發;

CREATE TRIGGER tg_test AFTER UPDATE ON YET FOR EACH ROW 
INSERT INTO CONTROLETRIGGER(idAluno, idNivel) VALUES (NEW.IdAluno, NEW.idNivel); 
UPDATE HistoricoNivel AS E 
JOIN(
    SELECT MAX(h.idNivel) Nivel, h.idAluno 
    FROM HistoricoNivel h 
    JOIN CONTROLETRIGGER v ON h.idaluno = v.idaluno 
    WHERE h.dtFim IS NULL 
    GROUP BY h.idAluno 
) X 
ON E.idAluno = X.idAluno AND E.idNivel= X.Nivel 
JOIN CONTROLETRIGGER vi ON vi.idaluno = E.idAluno 
SET E.dtFim = CASE WHEN X.nivel <> vi.idNivel THEN CURRENT_DATE() ELSE NULL END 
// 

See it compile here。