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SELECT ., . AS , ., ., . AS , ., ., ., ., !cod_prepod & ! AS FROM INNER JOIN ( INNER JOIN ( INNER JOIN ON .cod_predmet = .cod_predmet) ON .cod_prepod = .cod_prepod) ON .cod_student = .cod_student;
http://www.sql.ru/forum/1171515/sortirovka-i-gruppirovka-v-otchyote