MySQL子查询删除行

Question

我在执行子查询时遇到问题，以便删除应用程序中的某些特定行。这是我错误的SQL：

   delete from player_news_items 
     where id IN 
      (select id from player_news_items 
      where player_id NOT IN (select id from players));

编写此查询的正确方法是什么？

Answer 1

在MySQL中，除非使用update，否则无法引用delete或join中正在修改的表格。但是，我想你可能只想要这个：

delete pni
    from player_news_items pni
    where player_id NOT IN (select id from players));

作为一个说明，我建议用not exists：

写这个

delete pni
    from player_news_items pni
    where not exists (select 1 from players p where p.player_id = pni.player_id);