Query returns correct results, stored proc does not. Need a second set of eyes

My Query:

select
  *
from
  meet_cert_credit
where
  conf_number = '1132'
  and type_of_professional = 'Certified Hazardous Materials Managers'

My stored procedure:

ALTER PROCEDURE [dbo].[sp_check_credit_info] 

@cn varchar = NULL,
@top varchar = NULL
AS
BEGIN
SET NOCOUNT ON;

select 
    * 
from 
    meet_cert_credit开发者_Python百科 
where 
    Conf_number = @cn 
    and type_of_professional = @top
END

Calling my stored proc:

exec sp_check_credit_info '1132', 'Certified Hazardous Materials Managers'

When running the query, it returns results. When running the stored procedure, I get nothing.

Am I insane?

You need to give a length to your varchar stored procedure parameters.

e.g. use @cn varchar(30) not @cn varchar

Currently everything you are passing in is getting truncated to 1 character so you are effectively doing the following search.

select 
    * 
from 
    meet_cert_credit 
where 
    Conf_number = '1' 
    and type_of_professional = 'C'

Hence no results.