Вопросы и ответы о сайте для программистов
SELECT TOP 1000 * FROM ( SELECT u1.displayname , u1.Reputation AS u1_Reputation , u2.Reputation AS u2_Reputation , u3.Reputation AS u3_Reputation , u1.Reputation + u2.Reputation + u3.Reputation AS Reputation_sum FROM [StackOverflow]..[Users] u1 INNER JOIN [ServerFault]..[Users] u2 ON u1.AccountId = u2.AccountId INNER JOIN [SuperUser]..[Users] u3 ON u2.AccountId = u3.AccountId ) a ORDER BY reputation_sum DESC