CREATE TABLE review (i_id VARCHAR, rating INT)
CREATE TABLE item (title VARCHAR, i_id VARCHAR)

Find the name of the item with the lowest average rating.
SELECT T1.title FROM item AS T1 JOIN review AS T2 ON T1.i_id = T2.i_id GROUP BY T2.i_id ORDER BY AVG(T2.rating) LIMIT 1
SELECT "T1"."title" FROM "item" AS "T1" JOIN "review" AS "T2" ON "T1"."i_id" = "T2"."i_id" GROUP BY "T2"."i_id" ORDER BY AVG("T2"."rating") NULLS FIRST LIMIT 1