Question

I can see people doing joins in different ways

select a.acc, b.acc, c.acc from a, b,c
where a.acc=b.acc and c.acc = a.acc;

and

select a.acc, b.acc, c.acc JOIN on
a.acc=b.acc JOIN on c.acc = a.acc;

Is there any difference? I suppose not.

Answer 1

In terms of performance there is no difference.

I prefer the second approach for maintainability. It is more explicit which conditions are used to join which tables and it is easier to see whether or not you have missed out a join condition.