如何使用先前ID的結果進行SQL查詢？

Question

我有這個疑問

SELECT thread_id, COUNT(message) 
FROM xf_post 
GROUP BY message 
HAVING COUNT(message) > 1 

和thread_id單的和計數的結果。

問題：如何使用此thread_id的查詢從其他表中刪除行？

Answer 1

wrape的內心另一個SELECT語句查詢只選擇的thread_id

Delete from yourtable where id in 
(
SELECT temp.thread_Id 
From  
( SELECT thread_id, COUNT(message) 
      FROM xf_post 
      GROUP BY message 
      HAVING COUNT(message) > 1 
) temp  
) 

，你也可以做到這一點

with cte as 
(
      SELECT thread_id 
      FROM xf_post 
      GROUP BY message 
      HAVING COUNT(message) > 1 
) 

Delete from yourtable where id in 
    (
select thread_id from cte 
) 

Answer 2

的通常辦法做到這一點是使用in。如果要刪除具有多條消息的線程：

delete from othertable 
    where thread_id in (select thread_id 
         from xf_post 
         group by thread_id 
         having COUNT(message) > 1 
         );