If it were me, I would use multiple tables in the FROM clause:
SELECT DISTINCT l.name, l.email, l.id, 2.field_name,2.field_name_2
FROM login AS l,
submissions_2008 AS 2
Within in the WHERE clause, manage it the same way:
WHERE 2.sub_type=1.sub_type
I hope that helps, I am just beginning to get deeper into the SQL langauge.