复制SELECT * FROM t1 ORDER BY key_part1,关于key_part2,... ; SELECT * FROM t1 WHERE key_part1=constant ORDER BY key_part2; SELECT * FROM t1 WHERE key_part1=constant GROUP BY key_part2; SELECT * FROM t1 ORDER BY key_part1 DESC, key_part2 DESC; SELECT * FROM t1 WHERE key_part1=1 ORDER BY key_part1 DESC, key_part2 DESC; 1.2.3.4.5.6.7.8.9.