Hi, thanks for your response. I did a few years of work for my PhD thesis in Prolog but since then I'm a little disenchanted. A small overview as to why can be

Hi, thanks for your response. I did a few years of work for my PhD thesis in Prolog but since then I'm a little disenchanted. A small overview as to why can be seen here: http://programming-puzzler.blogspot.com/2013/03/logic-programming-is-overrated.html http://programming-puzzler.blogspot.com/2013/03/logic-progra... I'm also trying to put as much logic as possible into SQL (because it's declarative and can easily be reordered) but eventually you have too many conditionals to handle it in SQL, especially when high level parameters are involved that change whole queries and you'd have therefore conditional subqueries that can't easily be joined (e.g., flight paths, like ADA, ABDA, ABDBA, ZADAZ) where A/D is source/destination of the passenger.