SQL JOIN: is there a difference between USING, ON or WHERE?

Question

I was wondering if there is any difference in the way SQL performs on these join statements:

SELECT * FROM a,b WHERE a.ID = b.ID

SELECT * FROM a JOIN b ON a         


        

Answer 1

This is a duplicate of this SO question: Explicit vs implicit SQL joins. Generally I think the implicit (where version) is bad form and not as clear as the explicit (on version). I also think the implicit is being depreciated but not 100% on that one. The execution plan is the same for both though.