Problem with an alias in a stored procedure

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Hi all!
I have a stored procedure that retrieves the sum twice with two aliases and I create a variable to carry the value of the difference of both of them.

There is an error, can any one tell me how can I make it,please???

SQL

ALTER PROC select_test
(
    @Id bigint
)
AS
DECLARE @x AS bigint
SELECT test6.Id ,test6.summation as  TotalLoan   ,(select test6.summation from test6 where Name='b' and Id =@Id ) as TotalBorrower, @x as 'Total'
FROM test6  WHERE Name='a' and Id =@Id
GROUP BY test6.AccId,test6.summation
SET @x= TotalLoan - TotalBorrower
PRINT @x

Thanks in advance!

Posted 14-Mar-11 2:17am

moon2011

Updated 14-Mar-11 3:05am

Manfred Rudolf Bihy

v2

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Manfred Rudolf Bihy · Accepted Answer · 2011-03-14T03:15:00

First of all there are no parenthesis () around the parameter list. Second problem is that calculating the difference after the SELECT statement will not set column "Total" to that value. Try it in the likes of this:

SQL

ALTER PROC select_test
    @Id bigint
AS
DECLARE @difference AS bigint, @totalLoan AS bigint, @totalBorrower AS bigint;
SET @totalLoan = (SELECT test6.summation FROM test6 WHERE Id = @Id AND Name='a');
SET @totalBorrower = (SELECT test6.summation FROM test6 WHERE Id = @Id AND Name='b');
SET @difference = @totalLoan - @totalBorrower;

SELECT @Id AS Id, @totalLoan AS TotalLoan, @totalBorrower AS TotalBorrower, @difference AS Total
--PRINT @x

Please tell me if that is what you wanted.

Cheers!