Question

我需要一个MySQL语句来从我的表中删除最旧的10个条目，但是我能得到的最接近的是：

   DECLARE ID INT;
   SET ID = (SELECT CallbackID FROM callbacks ORDER BY CallbackID LIMIT 1 OFFSET 9);

   DELETE FROM callbacks WHERE callbackID <= ID;

如果总是有至少10个条目，那就没问题，但是当有少量条目时，ID没有设置，因此删除语句失败。

有什么想法吗？感谢

编辑：试过这个：

   DECLARE ID INT;
   SET ID = (SELECT CallbackID FROM callbacks ORDER BY CallbackID LIMIT 1 OFFSET 9);

   if ID IS NOT NULL THEN

   DELETE FROM callbacks WHERE callbackID <= ID;
   END IF;

Answer 1

DELETE FROM callbacks 
WHERE callbackID in (
    SELECT CallbackID 
    FROM callbacks 
    ORDER BY CallbackID LIMIT 10
)

Answer 2

怎么样：

DELETE FROM callbacks ORDER BY CallbackID LIMIT 10;

Yeah, it works :)

Answer 3

DELETE FROM callbacks ORDER BY callbackID DESC LIMIT 10

Answer 4

在SET之后，您只需要一个if语句来检查ID是否已设置，如果是，则执行查询，否则执行其他操作或不执行任何操作。

在MySQL中删除最旧的10行

4 个答案: