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Using a variable in the ORDER BY clause of an SQL stored procedure.

I am writing a stored procedure which will be used to run a SELECT query with multiple ORDER BY columns.  I will pass in the ORDER BY parameters -- @FIELD1, @FIELD2, for example.  Problem is, SQL won't let me use a variable in the ORDER BY clause.

I want the proc to look like this:

CREATE PROCEDURE udp_MULTI_SORT @FIELD1 VARCHAR(15), @FIELD2 VARCHAR(15)
AS

SELECT * FROM RM00101 ORDER BY @FIELD1, @FIELD2

The SQL error I get when I try this is:

The SELECT item identified by the ORDER BY number 1 contains a variable as part of the expression identifying a column position. Variables are only allowed when ordering by an expression referencing a column name.

Does anyone know a way around this?
0
T Hoecherl
Asked:
T Hoecherl
1 Solution
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
as the error message indicates: change the field names into field positions (data type int), OR you have to change to a "dynamic" sql at some point
CREATE PROCEDURE udp_MULTI_SORT @FIELD1 VARCHAR(15), @FIELD2 VARCHAR(15)
AS
SELECT * 
 FROM RM00101 
ORDER BY CASE 
   WHEN @FIELD1 = 'Col1' THEN Col1 
   WHEN @FIELD1 = 'Col2' THEN Col2
   --- etc ----
  END
,CASE 
   WHEN @FIELD2 = 'Col1' THEN Col1 
   WHEN @FIELD2 = 'Col2' THEN Col2
   --- etc ----
  END

// note: in above suggestion, you might need to add more "case statements" to accomodate for different data types
 



OR, the quick and dirty method


CREATE PROCEDURE udp_MULTI_SORT @FIELD1 VARCHAR(15), @FIELD2 VARCHAR(15)
AS
exec(SELECT * FROM RM00101 ORDER BY [' + @FIELD1 + '],[' + @FIELD2 +']')

Open in new window

0
 
firozmusthafaCommented:
try using "@field1 varchar(5) as feild1" and then in order by reference it as "fied1" your problem should be solved now
0
 
sammySeltzerCommented:
Hi,

Try using a CASE statement, something like:


CREATE PROCEDURE udp_MULTI_SORT @FIELD1 VARCHAR(15), @FIELD2 VARCHAR(15)
AS
set @FIELD1 ='Some fieldname'
@FIELD2  = 'some other fieldname'
--Then
SELECT * FROM RM00101
      ORDER BY CASE @FIELD1
            WHEN 'somefieldname' THEN Somefieldname
            CASE @FIELD2
           WHEN...
END
Else
select * from FROM RM00101

something like that.

That may need some tweaking but the context is sound.
0
 
T HoecherlDeveloperAuthor Commented:
Thank you angellll.  The "quick and dirty" was quick, dirty, slick and accurate.
0

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