What is recursion? Is it possible for a stored procedure to call itself or recursive stored procedure? How many levels of SP nesting is possible?
Recursion is method of problem solving where solution is arrived at by repetitively applying logic and solution to subsets of the problem.
Transact-SQL supports recursion. So, yes it's possible for a stored procedure to call itself.
Stored procedures and managed code references can be nested upto 32 levels.