Question

我想在带有日期和信息列的表中插入行。如果已经有一行具有相同的信息值且日期与今天的距离> = 1天，则不应发生插入。

假设当前日期：2017-01-03

id, info, date
1, a, 2017-01-01
2, b, 2017-01-02

要插入的新行：

info
c
a
b

预期运营：

c: gets inserted because no other row has the same info value
a: gets inserted because existing a has a date more than 1 day in the past
b: no insert because the time difference is not big enough

预期结果：

id, info, date
1, a, 2017-01-01
2, b, 2017-01-02
3, c, 2017-03-03
4, a, 2017-03-03

Answer 1

对于该约束，您必须触发以避免插入，这是一个未经测试的触发器示例，您可以实现所需的任何逻辑：

CREATE OR REPLACE TRIGGER tg_triggername
  BEFORE INSERT OR UPDATE ON table_name
  FOR EACH ROW
BEGIN
  IF( your_logic )
  THEN
    RAISE_APPLICATION_ERROR( 
      -20002, 
      'can't in sert already a row with the same info value and a date that is >= 1 day difference to today' );
  END IF;
END;

sql insert如果其他行具有相同的属性和日期＆gt; 1天

1 个答案: