CREATE TABLE reviewer (rid NUMBER, name CLOB)
CREATE TABLE rating (rid NUMBER, mid NUMBER, stars NUMBER, ratingdate TIME)
CREATE TABLE movie (mid NUMBER, title CLOB, year NUMBER, director CLOB)

Find the names of all reviewers who have contributed three or more ratings.
SELECT T2.name FROM rating AS T1 JOIN reviewer AS T2 ON T1.rid = T2.rid GROUP BY T1.rid HAVING COUNT(*) >= 3
SELECT "T2"."name" FROM "rating" "T1" JOIN "reviewer" "T2" ON "T1"."rid" = "T2"."rid" GROUP BY "T1"."rid" HAVING COUNT(*) >= 3