CREATE TABLE useracct (name VARCHAR, u_id VARCHAR)
CREATE TABLE review (rating INT, u_id VARCHAR)

For each user, return the name and the average rating of reviews given by them.
SELECT T1.name, AVG(T2.rating) FROM useracct AS T1 JOIN review AS T2 ON T1.u_id = T2.u_id GROUP BY T2.u_id
SELECT "T1"."name", AVG("T2"."rating") FROM "useracct" AS "T1" JOIN "review" AS "T2" ON "T1"."u_id" = "T2"."u_id" GROUP BY "T2"."u_id"