从多个列和行中查找最常用的值

Question

如何从同一个表的多个行和列中找到最常用的值（在本例中为整数）？

我建立一个梦幻足球比赛，我想每星期从用户的阵容得到了最常用的播放器（列PLAYER1以下图像中Player11的）：

Answer 1

-- create a temporary table 
CREATE TEMPORARY TABLE game_player (
    player_id INT NOT NULL, 
    game_date DATE NOT NULL, 
    PRIMARY KEY (player_id, game_date) 
); 

-- populate the table for player1-11 
INSERT INTO game_player 
SELECT player1, STR_TO_DATE(`day`, '%Y%m%d') FROM YOURTABLE; 
INSERT INTO game_player 
SELECT player2, STR_TO_DATE(`day`, '%Y%m%d') FROM YOURTABLE; 
... 
INSERT INTO game_player 
SELECT player11, STR_TO_DATE(`day`, '%Y%m%d') FROM YOURTABLE; 

-- view player_id and the date he played - the data you populated 
SELECT * FROM game_player; 

-- GROUP_CONCAT(game_date) to see what days they played (NOT REQUIRED) 
-- most-used player with #games 
SELECT player_id, COUNT(*) games, GROUP_CONCAT(game_date) game_dates 
FROM test.game_player 
GROUP BY player_id 
ORDER BY games DESC 
LIMIT 1; 

Answer 2

这是我到现在为止，虽然是超级慢（200s约1M记录）：

SELECT player, COUNT(*) AS `count` FROM (
SELECT player1 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player2 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player3 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player4 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player5 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player6 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player7 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player8 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player9 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player10 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player11 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player12 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player13 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player14 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
UNION ALL 
SELECT player15 AS `player` FROM `lineup` WHERE `lineup`.`day` = 2015026 
) AS matchDayPlayers GROUP BY player ORDER BY COUNT(*) DESC