mysql - MySQL 中不允许子查询限制，但我需要 "it"

Question

首先是 SQL =

delete 
  from eat_history 
 where food in 
    ( select food 
        from eat_history 
      where name ='minicake' 
       and cream='yes' 
     order 
        by eat_time desc 
      limit 1
    ) t1

我的目的是删除最近吃过的名为“minicake”和cream=“yes”的食物(可能有多个项目)。正如我在标题中指出的那样，MySQL 不允许这样做。然而，就我而言，“限制1”是关键点。有没有好的解决方法，最好是单个 SQL 语句？

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编辑:我在另一个问题中找到了答案，虽然MySQL不允许在IN子句中进行限制，但在子子查询中允许，例如在原来的“选择食物...”之外添加“选择*来自”可以解决该限制。说真的，我不知道为什么，但我测试了一下，没问题。

Answer 1

首先您应该删除 in 子句后的 t1

  delete from eat_history where food in (
      select food from eat_history where name='minicake' and cream='yes' 
      order by eat_time DESC  limit 1
      ) 

但是您可以通过连接使用组来避免限制

  delete from eat_history  e 
  inner join  (
      select food, max(eat_time)  max_time
      from eat_history 
      where name='minicake' and cream='yes' 
      group by foo
 ) t on t.food = e.food and t.max_time = e.eat_time