如何從mysql數據庫刪除舊記錄

Question

我想運行一個查詢，將刪除除最近9個條目之外的數據庫中的所有條目。 uid是id_lv，表被稱爲last_viewed

mysql_query('DELETE FROM last_viewed WHERE id_lv NOT IN (SELECT id_lv FROM last_viewed ORDER BY id_lv, desc LIMIT 0, 9'); 

我完全沒有錯誤，但沒有任何反應。

感謝

Answer 1

包圍錯誤。您錯過了子查詢中的關閉)，並且在DESC關鍵字之前不應該有逗號。

mysql_query('DELETE FROM last_viewed 
      WHERE id_lv NOT IN (
       SELECT id_lv 
       FROM last_viewed 
       ORDER BY id_lv desc 
       LIMIT 0, 9)'); 

Answer 2

mysql_query('DELETE FROM last_viewed 
       WHERE id_lv NOT IN 
       (SELECT id_lv FROM last_viewed 
       ORDER BY id_lv desc LIMIT 0, 9)');