從數據庫中刪除所有選定行除了前兩個

Question

我需要刪除數據庫中的所有日期，除了前兩個選擇日期：

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

我想在一個查詢刪除除前兩個所有日期。

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);