Who are all the drivers who was in position 1 as standing?
select * from drivers as t1 join driverstandings as t2 on t1.driverid = t2.driverid where t2.position = 1
Among them, show those who also won?
select * from drivers as t1 join driverstandings as t2 on t1.driverid = t2.driverid where t2.position = 1 and t2.wins = 1
Furthermore, show the distinct forenames of those who had more than 20 points.
select distinct t1.forename from drivers as t1 join driverstandings as t2 on t1.driverid = t2.driverid where t2.position = 1 and t2.wins = 1 and t2.points > 20