Recursive SQL can be very elegant and efficient. However, because of the difficulty developers can have understanding recursion, it is sometimes thought of as 'too inefficient to use frequently.' But, ...

Processing occurs one at a time and calls a SQL Server stored procedure. The SPROC is recursive. For each ID that is submitted, it can have any number of child ID's.

In this article, we study some new characterizations of primitive recursive functions based on restricted forms of primitive recursion, improving the pioneering work of R. M. Robinson and M. D.