joins and indexes -- a=b or b=a?

if you have a main table on which you're doing a linear scan:

	create table person (
		id varchar(12), -- handle/id/login
		name varchar(30),
		gang int4
	);

that joins another indexed table:

	create table gang (
		id serial,
		name varchar(30),
	primary key(id)
	);

is there any significant difference in the following two queries:

	select
		p.id as handle, p.name as person, g.name as gang
	from
		person p, gang g
	where
		PERSON.GANG = GANG.ID
	;

	-- as opposed to:

	select
		p.id as handle, p.name as person, g.name as gang
	from
		person p, gang g
	where
		GANG.ID = PERSON.GANG
	;

the only difference is GANG.ID=PERSON.GANG versus
PERSON.GANG=GANG.ID in the WHERE clause. does it matter?

-- 
It is always hazardous to ask "Why?" in science, but it is often
interesting to do so just the same.
		-- Isaac Asimov, 'The Genetic Code'

will@serensoft.com
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