A common question that raise in forums: Is The Order of columns important? 

We focus on the database's side and not the client's side point-of-view. For example, is order of columns related to performance, is it related to errors that might rise only when use specific order, or will SELECT query return different DATA (not important the order of the result SET but the DATA) if the order of columns is different...

In this post I want to present some simple demo which answer the question

Update 2019-03-21: adding example from my last lecture.