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create table users (id int, name varchar(64)); insert into users values (1, 'John'), (2, 'Jane'), (3, 'Bill'); create table replies(user_id int, rate int); insert into replies values (1, 5), (3, 3), (3, 5), (1, 1), (1, 1); select name, avg(rate) rate from users u left join replies r on r.user_id = u.id group by u.name order by rate desc
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