CREATE TABLE Movie (mID VARCHAR, year VARCHAR)
CREATE TABLE Rating (mID VARCHAR, stars VARCHAR)

Find all years that have a movie that received a rating of 4 or 5, and sort them in increasing order of year.
SELECT DISTINCT year FROM Movie AS T1 JOIN Rating AS T2 ON T1.mID = T2.mID WHERE T2.stars >= 4 ORDER BY T1.year
SELECT DISTINCT "year" FROM "Movie" AS "T1" JOIN "Rating" AS "T2" ON "T1"."mID" = "T2"."mID" AND "T2"."stars" >= 4 ORDER BY "T1"."year" NULLS FIRST