Question

这是我的代码，但我需要group by选项，因为我需要通过Derparti对子查询进行分组，例如我需要找到每个部门中有多少医生工作，所以我需要我的子查询返回多行。

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;

Answer 1

您需要将子查询从选择列表移动到列表中作为派生表。使用表/查询作为第一个返回所有（或至少最多）部门的表，并使用departments字段将其连接到tge 1st表上的其他派生表。我将为您提供3个子查询的示例代码，假设医生表中包含所有部门：

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，我会将部门的主数据表用作最左边的表。既然你没有提到任何关于它的事情，我没有把它包括在内。

子查询返回多行？

1 个答案: