Table: nascar_2005_series
Columns: team
car_s
col
driver_s
primary_sponsor_s
listed_owner_s
crew_chief

Question: Who owned the team Jeremy Mayfield raced for?
SQL: SELECT "listed_owner_s" FROM nascar_2005_series WHERE "driver_s" = 'Jeremy Mayfield'

Question: Who is Jason Leffler's primary sponsor?
SQL: SELECT "primary_sponsor_s" FROM nascar_2005_series WHERE "driver_s" = 'Jason Leffler'