> > Indeed, it doesn't matter. Firebird will decide what to do
> > first, depending on conditions like "is there an index available
> > for a column".
> >
>
> What happen if all fields in WHERE, are indexes? which of them is
> more important?

Then the optimizer will decide what to do.

Either way, the order in the WHERE clause as written by the
user is un-important to Firebird.