CREATE TABLE wine (no DECIMAL, grape TEXT, winery TEXT, appelation TEXT, state TEXT, name TEXT, year DECIMAL, price DECIMAL, score DECIMAL, cases DECIMAL, drink TEXT)
CREATE TABLE grapes (id DECIMAL, grape TEXT, color TEXT)
CREATE TABLE appellations (no DECIMAL, appelation TEXT, county TEXT, state TEXT, area TEXT, isava TEXT)

Find the white grape used to produce wines with scores above 90.
SELECT DISTINCT T1.grape FROM grapes AS T1 JOIN wine AS T2 ON T1.grape = T2.grape WHERE T1.color = "White" AND T2.score > 90
SELECT DISTINCT "T1"."grape" FROM "grapes" AS "T1" JOIN "wine" AS "T2" ON "T1"."grape" = "T2"."grape" AND "T2"."score" > 90 WHERE "T1"."color" = "White"