Context: CREATE TABLE review (rating INTEGER, u_id VARCHAR); CREATE TABLE useracct (name VARCHAR, u_id VARCHAR)
Question: For each user, return the name and the average rating of reviews given by them.
Answer: 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