Using the Aggregate Function

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hi friends,
I am trying to write a query where i have to join three tables and to display Employee name and Difference between Sum(Estimated Hours) and Sum(Actual Hours) in a grid.
But on executing the following code , the following Error is shown " Column 'Tasks.Emp_ID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause".

SQL

SELECT  
	  
	  Tasks.[Emp_ID],
	  EMPLOYEE.[Emp_Name],
	  Department.[Dept_ID],
	  Department.[Dept_Name],
	  (Sum(Estimated_Hours)-  Sum(Actual_Hours))as Total ,
	  Status_Id
	 	 
	  FROM Tasks   
	  
	  Left Join Employee
	  ON EMPLOYEE.[Emp_ID] = Tasks.[Emp_ID]
	  
	  
	  Left JOIN Department
	  ON EMPLOYEE.Dept_ID = Department.Dept_ID
	  
	  Where Tasks.Status_Id ='1' Or Tasks.Status_Id ='2'
	  Group By Employee.[Emp_Name]	  
    End

someone help me out ...
Thanks in Advance

Posted 28-Jul-13 21:02pm

MohRizwan

Updated 28-Jul-13 21:10pm

Sushil Mate

v2

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Aswathi Narayan · Accepted Answer · 2013-07-28T21:08:00

try this

SQL

select 
Tasks.[Emp_ID],
EMPLOYEE.[Emp_Name],
Department.[Dept_ID],
Department.[Dept_Name],
(Sum(Estimated_Hours)- Sum(Actual_Hours))as Total ,
Status_Id

FROM Tasks 

Left Join Employee
ON EMPLOYEE.[Emp_ID] = Tasks.[Emp_ID]


Left JOIN Department
ON EMPLOYEE.Dept_ID = Department.Dept_ID

Where Tasks.Status_Id ='1' Or Tasks.Status_Id ='2'
Group By Employee.[Emp_Name],Tasks.[Emp_ID],
EMPLOYEE.[Emp_Name],
Department.[Dept_ID],
Department.[Dept_Name],
Status_Id

End