用于删除行的SQLite触发器表达式

Question

我有2个表A(id,Name),B(id,fid,Name),其中A.id = B.fid,我的要求是我想删除B中的行,只要A中的行删除

这是我试过的查询,但它给了我B附近的错误..

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

Answer 1

DELETE命令需要 FROM.

要访问触发表中的值,您必须使用OLD或NEW别名.

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