刪除行SQLite觸發表達式

Question

我有2個表A（id，Name），B（id，fid，Name）其中A.id = B.fid，我的要求是我想刪除B中的行每當行中的刪除

這裏查詢，我試過，但它給了我錯誤附近乙..

Create Trigger Delete_B_trigger After Delete on A For each row Begin Delete from B where fid = id; End 

Answer 1

DELETE命令requires一個FROM。

要訪問觸發表中的值，必須使用OLD or NEW別名。

CREATE TRIGGER Delete_B_trigger 
AFTER DELETE ON A 
FOR EACH ROW 
BEGIN 
    DELETE FROM B WHERE fid = OLD.id; 
END