Mysql 子查询返回多行？

这是我的代码，但我需要groupby选项，因为我需要按Derparti对子查询进行分组，例如，我需要找到每个科室的医生人数，因此我需要子查询返回多行

SELECT d.Dreparti,
  (SELECT avg(Paga)
   FROM dpaga dp
   WHERE d.titulli=dp.titulli
   GROUP BY Dreparti),
  (SELECT COUNT(*)
   FROM Doktori
   GROUP BY Dreparti),
  (SELECT COUNT(*)
   FROM doktori d,
        Hospitalizimidata hd
   WHERE d.did=hd.did
   GROUP BY Dreparti),
  (SELECT sum(CmimipaTVSH)
   FROM faturat f,
        hospitalizimidata h,
        doktori d
   WHERE f.hid=h.hid
     AND h.did=d.did
     AND DataFatures BETWEEN CAST(CURDATE() - INTERVAL 365 DAY AS DATE) AND CAST(curdate() AS DATE)
   GROUP BY Dreparti) ,
  (SELECT sum(Cmimi)
   FROM faturat f,
        hospitalizimidata h,
        doktori d
   WHERE f.hid=h.hid
     AND h.did=d.did
     AND DataFatures BETWEEN CAST(CURDATE() - INTERVAL 365 DAY AS DATE) AND CAST(curdate() AS DATE)
   GROUP BY Dreparti) ,
  (SELECT sum(Cmimi)
   FROM pagesat p,
        faturat f,
        hospitalizimidata h,
        doktori d
   WHERE f.hid=h.hid
     AND h.did=d.did
     AND p.fid=f.fid
     AND DataFatures BETWEEN CAST(CURDATE() - INTERVAL 365 DAY AS DATE) AND CAST(curdate() AS DATE)
   GROUP BY Dreparti)
FROM doktori d
GROUP BY Dreparti;

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您需要将子查询作为派生表从“选择”列表移动到“从”列表。使用表/查询作为第一个返回所有（或至少大多数）部门的表/查询，并使用departments字段在tge first one上左键联接其他派生表。假设doctors表包含所有科室，我将为您提供3个子查询的示例代码：

SELECT * FROM
  (SELECT Dreparti, COUNT(*) AS NoOfDoctors
   FROM Doktori
   GROUP BY Dreparti) t1
  LEFT JOIN (SELECT Dreparti, avg(Paga) AS AvgPaga
   FROM dpaga dp inner join Doktori d
   ON d.titulli=dp.titulli
   GROUP BY Dreparti) t2 ON t1.Dreparti=d2.Dreparti
  LEFT JOIN (SELECT Dreparti, COUNT(*) AS NoOfSomething
   FROM doktori d INNER JOIN
        Hospitalizimidata hd
   ON d.did=hd.did
   GROUP BY Dreparti) t3 ON t1.Dreparti=t3.Dreparti

---

但是，我会使用部门的主数据表作为最左边的表。因为你没有提到它，所以我没有把它包括在内。

你想实现什么？尽量简化您的案例，您的问题很长。请提供预期输出！我不确定是否可以在单个查询中包含所有这些查询。哪些表包含此Dreparti字段？哪个表包含所有的Dreparti值？欢迎使用堆栈溢出。您已将问题标记为和。请编辑您的问题并删除其中一个标记——它们用于不同的SQL方言。另外，请尽量减少代码示例，并指定希望得到的结果集示例。@shadowtable doktori包含Dreparti