CREATE PROC  [dbo].[usp_spFactorial]@InputValue INT,@OuputValue INT OUTPUTASBEGIN     DECLARE @InValue    INT;     DECLARE @OutValue    INT;       IF(@InputValue!=0)            BEGIN                 SET @InValue = @InputValue - 1;                 EXEC usp_spFactorial @InValue,@OutValue OUTPUT;                 SELECT @OuputValue = @InputValue + @OutValue;            END        ELSE            BEGIN            SET @OuputValue = 0;            ENDEND