what are all the different colors of grapes?
select distinct color from grapes
What are the names of wines that are made of white color grapes?
select t2.name from grapes as t1 join wine as t2 on t1.grape = t2.grape where t1.color = "White"
also show their scores.
select t2.name, t2.score from grapes as t1 join wine as t2 on t1.grape = t2.grape where t1.color = "White"