Mysql 技巧
order by条件:
SELECT * FROM tablename WHERE id_one=27 OR id_two=27 ORDER BY CASE WHEN id_one=27 THEN timestamp_one END DESC, CASE WHEN id_two=27 THEN timestamp_two END DESC
order by条件:
SELECT * FROM tablename WHERE id_one=27 OR id_two=27 ORDER BY CASE WHEN id_one=27 THEN timestamp_one END DESC, CASE WHEN id_two=27 THEN timestamp_two END DESC