exec stored procedure

USE Database;
GO
-- Passing values as constants.
EXEC dbo.uspGetWhereUsedProductID 819, '20050225';
GO
-- Passing values as variables.
DECLARE @ProductID int, @CheckDate datetime;
SET @ProductID = 819;
SET @CheckDate = '20050225';
EXEC dbo.uspGetWhereUsedProductID @ProductID, @CheckDate;
GO
-- Try to use a function as a parameter value.
-- This produces an error message.
EXEC dbo.uspGetWhereUsedProductID 819, GETDATE();
GO
-- Passing the function value as a variable.
DECLARE @CheckDate datetime;
SET @CheckDate = GETDATE();
EXEC dbo.uspGetWhereUsedProductID 819, @CheckDate;
GO