SQL Server：是否调用存储过程

Question

I have a stored procedure that has one input parameter.

However, in the stored procedure, there is a condition that needs user's input ( WHEN t.flag = 0 ).

Is there a way not to call a new stored procedure but does the same job?

I do not want to add another input parameter in [dbo].[UpdateTheRate] itself because I have other processes going on in this stored procedure.

ALTER PROCEDURE [dbo].[UpdateTheRate] (@PID int)
AS
    UPDATE t
    SET t.rate = 
            CASE 
               WHEN t.flag = 1 THEN (select UnitRate 
                                     from RateTable 
                                     where state ='IL' and Term='20')
               WHEN t.flag = 0 THEN EXEC [dbo.rate_procedure]  --(USER enter rate)
    FROM TblChargeTable t
    WHERE t.PID = @PID

Answer 1

Something along these lines?

ALTER PROCEDURE [dbo].[UpdateTheRate] (@PID int)
AS

-- defer executing the procedure unless necessary
IF EXISTS (SELECT 1 FROM TblChargeTable WHERE flag = 0 and PID = @PID)
BEGIN
   EXEC dbo.rate_procedure; -- get @user_rate via return code or out parameters perhaps
END

UPDATE t
SET    t.rate = 
       CASE WHEN t.flag = 1 THEN (select UnitRate from RateTable where state ='IL' and Term='20')
            WHEN t.flag = 0 THEN @user_rate END -- retrieved above
FROM   TblChargeTable t
WHERE  t.PID = @PID;