Combine two integers to create a unique number

Question

Good Morning,

I was looking for a way to combine two integers to create a unique number, I have two tables that I need to combine into a third table with unique numb

Answer 1

combinedid = classid*1000 + schoolid

And then, later:

classid = combinedid / 1000 // Integer division
schoolid = combinedid % 1000