Question

I am new to SQL and trying to write a stored procedure. I am having some difficulties to get default values as an output result.

I have 2 table:

Student_Input:

InputID SectionID  ParameterName    Sequence
------------------------------------------------     
  1     100        FirstName           1 
  2     100        MiddleName          2  
  3     100        LastName            3  

Student_Input_details:

ParameterName   ParameterValue      DefaultValue
-----------------------------------------------------     
FirstName          John                  1    
FirstName          Troy                  0
FirstName          Mark                  0  

I am trying to call ParameterName from Student_Input and Its default value from Student_Input_Details as an output in one table. I am trying with following query but I am getting following error:

Msg 201, Level 16, State 4, Procedure Getparameterdefaultvalues, Line 0
Procedure or function ‘Getparameterdefaultvalues’ expects parameter ‘@ParameterValue’, which was not supplied.

I am sure I am missing something important here.

My query is below. I am learning , it may be an easy question. Thx……..

CREATE PROCEDURE Getparameterdefaultvalues
(
    @ParameterName varchar(50) ,
    @ParameterValue varchar(50) OUT
)
AS
BEGIN
    SELECT @ParameterValue = DefaultValue FROM ParameterInput_Values
    WHERE ParameterName=@ParameterName 
END
DECLARE @ParameterValue varchar(50) 
EXEC Getparameterdefaultvalues @ParameterName = 1, @ParameterValue OUTPUT
PRINT 'Result is: ' + @ParameterValue

I need result like (i.e. ParameterName should only display its default value at runtime):

ParameterName   ParameterValue      
---------------------------------- 
FirstName         John

I have tried on other blogs but couldn’t resolve this. Apologies If my question is not so cleared. Any help would be great!! Thx

Answer 1

Pretty simple and easy: your stored procedure expects two parameters – @ParameterName and @ParameterValue – but your call only supplies one…

You should call your stored procedure like this:

DECLARE @ParameterValue varchar(50) 

EXEC Getparameterdefaultvalues @ParameterName = 1, @ParameterValue = @ParameterValue OUTPUT

PRINT 'Result is: ' + @ParameterValue

Also: you’re returning the retrieved value as an output parameter – so you’re getting back a single value into a variable – you’re not getting back a result set (rows/columns).