如果column = X，则通过DESC进行MySQL排序，否则ASC

Question

如果finished = 1，我该如何通过start_date DESC命令查询，否则start_date ASC。现在它看起来就象这样：

SELECT game_id, 
    event_id, 
    start_date, 
    best_of, 
    home_team_id, 
    away_team_id, 
    home_value, 
    away_value, 
    home_result, 
    away_result, 
    stream_url, 
    stats_url, 
    comments, 
    finished 
FROM betting_games 
ORDER BY finished ASC, 
    start_date ASC 
LIMIT 5 

Answer 1

这里有一种方法：

SELECT * 
FROM betting_games 
ORDER BY finished ASC, 
     CASE 
      WHEN finished = 1 THEN - 1 * UNIX_TIMESTAMP(start_date) 
      ELSE UNIX_TIMESTAMP(start_date) 
     END ASC 

不能从CASE表达式返回DESC或ASC。使用UNIX_TIMESTAMP，日期字段start_date被转换为一个整数，可用于以降序（一旦否定）存储。

Demo here