mysql - 将两个条件与不同的表 MySQL 结合起来

Question

我可以用这两个条件进行一次查询吗？如果是的话，我应该往哪边挖？

SELECT c.ID, c.DateEnd FROM conference c WHERE DateEnd = DATE_ADD(CURDATE(),INTERVAL 1 DAY)

SELECT a.ID, a.IDConf FROM application a GROUP BY a.IDConf HAVING COUNT(a.IDConf) >= 2

Answer 1

如果您只想连接HAVING COUNT(a.IDConf) >= 2的结果，您可以在子选择上使用内部连接

  SELECT c.ID, c.DateEnd 
  FROM conference c 
  INNER  JOIN (
  SELECT a.ID, a.IDConf 
  FROM application a 
  GROUP BY a.IDConf 
  HAVING COUNT(a.IDConf) >= 2 
  ) t ON c.ID=t.IDConf  
   WHERE c.DateEnd = DATE_ADD(CURDATE(),INTERVAL 1 DAY)