Question

我试图忽略薪水高于5000的员工的删除。我在after delete表上使用Employee触发器。如果删除的员工的薪水更高，则将其重新插入到Employee表中。

CREATE TRIGGER T1 ON Employee 
AFTER DELETE
AS
    INSERT INTO Employee
        SELECT * 
        FROM DELETED D
        WHERE D.salary > 5000

有什么方法可以执行此操作而无需重新插入行？如何使用INSTEAD OF触发器代替AFTER DELETE？

Answer 1

INSTEAD OF触发器可以决定要做什么，而不是像AFTER触发器那样面对更改的记录。这主要用于基于多个表且需要更新的视图。然后，触发器必须将更新定向到正确的基础表。

您可以的话

CREATE TRIGGER T1 ON Employee INSTEAD OF DELETE
AS
  DELETE FROM Employee
  FROM Employee e
    INNER JOIN deleted d ON e.EmployeeID = d.EmployeeID
  WHERE e.salary <= 5000

确保禁用递归触发器。

删除后替换触发器替换为触发器

1 个答案: