Question

我想创建一个触发器，在该触发器中，当在pgadmin 4中插入任何新员工时，更新总数

这是我的代码

CREATE TRIGGER test_trigger
AFTER INSERT ON employee
FOR EACH ROW
UPDATE counter SET counter.count = counter.count + 1

Answer 1

您必须将更新放入“触发”功能

CREATE OR REPLACE FUNCTION update_counter()
  RETURNS trigger
AS $$
        BEGIN
            UPDATE counter SET count = count + 1; --where clause?
                 RETURN NULL;
        END;
$$ LANGUAGE plpgsql;

触发器应调用该函数。

CREATE TRIGGER test_trigger
  AFTER INSERT ON employee
    FOR EACH ROW
  EXECUTE procedure update_counter();

DEMO

插入任何新员工时创建触发器以更新总数

1 个答案: