錯誤在我編隊SQL查詢

Question

的下面是我的查詢，其獲得的地層錯誤，查詢將描述它的結構.....誰能幫助這個

SELECT (CAST(Empid AS VARCHAR)+' '+EmployeeName) AS Employee 
     ,COUNT(ActualDate)Total_No_Days 
     ,(SELECT COUNT(ActualDate) 
      from BufferListforBilling 
      where BufferEmpName IS NOT NULL 
      GROUP BY EmpId) as BillDays 
     ,(SELECT COUNT(ActualDate) 
      from BufferListforBilling 
      where BufferEmpName IS NULL 
      GROUP BY EmpId) as NonBillDays 
FROM BufferListforBilling 
WHERE Team = 'ABC' 
GROUP BY Empid ,EmployeeName 


Empid ActualDate EmpName BuffEmpNames 
=========================================== 
1  5/6/10  Roy  NULL 
1  6/6/10  Roy  NULL 
1  7/6/10  Roy  Assigned 
1  8/6/10  Roy  Assigned 
2  5/6/10  Deb  Assigned 
2  6/6/10  Deb  NULL 
2  7/6/10  Deb  NULL 
2  8/6/10  Deb  NULL 

以上是我的表結構，我需要得到一個輸出中像下面

Employee Total_No_of_Days Bill_Days Non_Bill_Days 
=============================================================== 
1-Roy  4     2   2 
2-Deb  4     1   3 

Answer 1

您可以在select部分中使用子查詢，僅當它們返回標量（單列和單列）值時才允許使用子查詢。

似乎

SELECT COUNT(ActualDate) 
from BufferListforBilling 
where BufferEmpName IS NOT NULL 
GROUP BY EmpId) as BillDay 

返回多行（由於GROUP BY）。

這並不完全清楚你的意圖是什麼。如果你確切解釋你想要什麼，你會得到更好的幫助。另外，請說明您的RDBMS引擎。

編輯 隔空（但願不是這樣）胡亂猜測試試這個

SELECT (CAST(Empid AS VARCHAR)+' '+EmployeeName) AS Employee 
     ,COUNT(ActualDate) Total_No_Days 
     ,COUNT(BufferEmpName) as BillDays 
     ,COUNT(BufferEmpName)-COUNT(ActualDate) as NonBillDays 
FROM BufferListforBilling 
WHERE Team = 'ABC' 
GROUP BY Empid ,EmployeeName 

（辦通知，其中AcutalDate是NOT NULL您Total_No_Days只會計算行;使用COUNT（*）如果你想統計所有行）

Answer 2

看起來你與+連接字符串。據我所知，SQL不支持這一點。你應該看看CONCAT()-function。