Table: sakata_1991_125cc
Columns: year
class
team
machine
points
rank
wins

Question: Which year had a team of Aprilia and a rank of 4th?
SQL: SELECT "year" FROM sakata_1991_125cc WHERE "team" = 'aprilia' AND "rank" = '4th'

Question: Which class had a machine of RS125R, points over 113, and a rank of 4th?
SQL: SELECT "class" FROM sakata_1991_125cc WHERE "machine" = 'rs125r' AND "points" > 113 AND "rank" = '4th'

Question: Which team had a year over 1995, machine of RS125R, and ranked 1st?
SQL: SELECT "team" FROM sakata_1991_125cc WHERE "year" > 1995 AND "machine" = 'rs125r' AND "rank" = '1st'