Problem in SQL Server Statement in stored procedure

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Hi guys,
I have two table:

SQL

create table Employees
(
   EmployeeID int Primary key identity(1,1) not null,
   EmployeeName varchar(50)
)

SQL

create table Orders
(
  OrderID int Primary key identity(1,1) not null,
  OrderName varchar(40),
  EmployeeID int constraint FK_Orders_Employees_EmployeeID foreign key (EmployeeID) references Employees(EmployeeID) not null
)

i want to execute this SQL Statement:

SQL

select Employees.EmployeeID,Employees.EmployeeName,
(select Orders.OrderID,Orders.OrderName from Orders where Orders.EmployeeID=Employees.EmployeeID)
from Employees
where Employees.EmployeeID between 1 and 40

But it give me error that:

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

Then what can i do please.

Posted 17-May-11 22:38pm

MrLonely_2

Updated 17-May-11 23:46pm

thatraja

v2

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Dylan Morley · Accepted Answer · 2011-05-17T22:45:00

Solution 1

Why not just use inner join, sub-query provides no benefit in this case...

SQL

select E.EmployeeID, E.EmployeeName, O.OrderID, O.OrderName 
from Employees E
inner join Orders O On E.EmployeeID = O.EmployeeID
where E.EmployeeID between 1 and 40

Posted 17-May-11 22:45pm

Dylan Morley

Comments

MrLonely_2 18-May-11 4:49am

Thanks

^That's **Aragon** · Accepted Answer · 2011-05-17T23:05:00

You need to tweak a little. You could achieve it with several different method.

(1) Use VIEW
- Create a view(vw_view) of Employee and Order table like below.

SQL

SELECT     dbo.Employees.EmployeeName, dbo.Employees.EmployeeID, dbo.Orders.OrderID, dbo.Orders.OrderName
FROM         dbo.Employees INNER JOIN
                      dbo.Orders ON dbo.Employees.EmployeeID = dbo.Orders.EmployeeID

and then query like this

SQL

SELECT
v.EmployeeID,v.EmployeeName,v.OrderID,v.OrderName
FROM
vw_emp v
WHERE
v.EmployeeID BETWEEN 1 AND 40

(2) Use SubQuery
- Same above query can be used as subquery. I would recommended to use VIEW over subquery for readability and also it would help in future if some conditions will change or some table alternation will be needed.

SQL

SELECT     dbo.Employees.EmployeeName, dbo.Employees.EmployeeID, dbo.Orders.OrderID, dbo.Orders.OrderName
FROM         dbo.Employees INNER JOIN
                      dbo.Orders ON dbo.Employees.EmployeeID = dbo.Orders.EmployeeID
WHERE Employees.EmployeeID between 1 and 40

(3) Get two separate result (NOT recommended)

SQL

select Employees.EmployeeID,Employees.EmployeeName
from Employees
where Employees.EmployeeID between 1 and 40

and

SQL

select Orders.OrderID,Orders.OrderName,Orders.EmployeeID from Orders,Employees

 where Orders.EmployeeID=Employees.EmployeeID

and Employees.EmployeeID between 1 and 40

You can apply filter at your business logic(in C#, VB or any other programming language you are using).

Hope it helps.