如何从mysql数据库删除旧记录

Question

我想运行一个查询，将删除除最近9个条目之外的数据库中的所有条目。 uid是id_lv，表被称为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'); 

我完全没有错误，但没有任何反应。

感谢

Answer 1

包围错误。您错过了子查询中的关闭)，并且在DESC关键字之前不应该有逗号。

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)');