从数据库中删除除前两行之外的所有选定行

Question

除了前两个选定日期，我需要删除数据库中的所有日期：

SELECT DateColumn 
FROM Table 
GROUP BY date(DateColumn) 
ORDER BY DateColumn DESC

我希望在一个查询中删除除前两个之外的所有日期。

Answer 1

delete from table where DateColumn not in(
SELECT DateColumn 
FROM Table 
GROUP BY date(DateColumn) 
ORDER BY DateColumn DESC LIMIT 2)

Answer 2

DELETE FROM Table
      WHERE DateColumn NOT IN (SELECT DateColumn 
                                 FROM Table 
                             GROUP BY date(DateColumn) 
                             ORDER BY DateColumn DESC
                                LIMIT 2);