Posts tagged factorial
I regularly teach a masterclass on Oracle SQL. One of the topics I explore in depth is the use of the CONNECT BY query style to perform not just hierarchical queries but also networking or even generic recursive SQL. In Oracle Database 11g, the recursive subquery was formally introduced, the SQL Standard’s approach to this style of querying. The Recursive Subquery even stronger suggest recursive operations to be performed of course, but classic connect by can do that job as well.
One archetypical example of a recursive operation is the calculation of a factorial: n! = 1* 2 * 3 *â€¦. * (n-1) * n.
In this short post I will show both the new, straightforward 11g based solution as well as the classic approach with CONNECT BY – that may not looks as recursive, but still very much is.