Question

I am passing two parameters i.e @AccountId and @key. I want to show all the values present in the database for @AccountId and @key when there is no values in the parameters i.e @AccountId and @key. I want to do this for the same dataset. Is this possible or i have create different datasets?

The query which I am using is :

CREATE PROCEDURE [dbo].[GetDenyList]
@AccountId nvarchar(100),
@key nvarchar(400)
AS
select New_AccountId AS 'AccountId/Key', New_Description AS 'Reason',CreatedOn AS 'Date'
  from abc.dbo.New_keydenylist 
 where New_AccountId is not null
   AND @AccountId = New_AccountId
 union all
select new_key AS 'AccountId/Key', New_Description AS 'Reason',CreatedOn AS 'Date' 
  from abc.dbo.New_keydenylist 
 where New_key is not null
   and @Key=New_key

Answer 1

If I understand your question well, you have to use any predicate that always evaluate to true regardless to the parameters’ values passed to the WHERE clause. For example WHERE 1 = 1:

 WHERE 1 = 1
 AND (@AccountId IS NOT NULL OR AccountId = @AccountId)

The same with @key parameter:

 WHERE 1 = 1
 AND (@key IS NOT NULL OR New_key = @key)

If the two parameters @key and @AccountId are both NULL or one of them, then the WHERE clause still be valid and return all the row as it were not presented.