Database: epinions_1

Question: Find each target user's name and average trust score.
SQL: SELECT T1.name ,  avg(trust) FROM useracct AS T1 JOIN trust AS T2 ON T1.u_id  =  T2.target_u_id GROUP BY T2.target_u_id

Question: Find the name of the target user with the lowest trust score.
SQL: SELECT T1.name FROM useracct AS T1 JOIN trust AS T2 ON T1.u_id  =  T2.target_u_id ORDER BY trust LIMIT 1

Question: Find the names of the items that did not receive any review.
SQL: SELECT title FROM item WHERE i_id NOT IN (SELECT i_id FROM review)

Question: Find the names of users who did not leave any review.
SQL: SELECT name FROM useracct WHERE u_id NOT IN (SELECT u_id FROM review)