Yes. Because Transact-SQL supports recursion, you can write stored procedures that call themselves. Recursion can be defined as a method of problem solving wherein the solution is arrived at by repetitively applying it to subsets of the problem. A common application of recursive logic is to perform numeric computations that lend themselves to repetitive evaluation by the same processing steps. Stored procedures are nested when one stored procedure calls another or executes managed code by referencing a CLR routine, type, or aggregate.

You can nest stored procedures and managed code references up to 32 levels.


 Explain about recursive stored procedures?
Ans: Recursive stored procedures are used for performing repetitive tasks. Recursive feature is disabled by default but can be activated by using the following command on the server max_sp_recursion_depth, also don’t forget to rename the system variable to a non zero variable.

Can a stored procedure call itself or recursive stored procedure? How much level SP nesting is possible?
Ans: Yes. Because Transact-SQL supports recursion, you can write stored procedures that call themselves. You can nest stored procedures and managed code references up to 32 levels.

Have you ever created or used recursive stored procedure? Give example?
Ans: I created a recursive stored procedure for calculating the factorial of a number.

CREATE PROCEDURE [dbo].[Factorial_ap]
( @Number Integer,@RetVal Integer OUTPUT )

AS
    DECLARE @In Integer
    DECLARE @Out Integer
    IF @Number != 1
        BEGIN
        SELECT @In = @Number – 1
        EXEC Factorial_ap @In, @Out OUTPUT
        SELECT @RetVal = @Number * @Out
    END
        ELSE
            BEGIN
                SELECT @RetVal = 1
            END
RETURN

GO