MySQL查詢中的單引號不適用於concat（）

Question

SELECT `osid`,`os_name`,     
       (SELECT count(*)
       FROM `game_game`
       WHERE concat(',',`os`,',') LIKE ('%,`os`.`osid`,%') ) as game_count
 FROM `game_os` AS os ORDER BY `osid`

兩個SQL表

game_os

osid (PK)
os_name

game_game

game_id (PK)
game_name
os (save data format : 1,2,3) (1,2,3 = osid)

這個SQL查詢，game_count從不= 0

我覺得可能'％， os 。 osid ，％'因為os 。 osid在'XX' < -

我該如何解決這個問題？

我需要在一個操作系統中獲得多少游戲

Answer 1

你需要concat()的like ：

SELECT osid, os_name,
       (SELECT count(*)
        FROM game_game
        WHERE concat(',', os, ',') LIKE CONCAT('%,', os.osid, ',%')
       ) as game_count
FROM game_os AS os
ORDER BY osid;

但是，您也可以使用find_in_set()來編寫它，因為您使用逗號分隔符：

SELECT osid, os_name,
       (SELECT count(*)
        FROM game_game
        WHERE find_in_set(os.osid, os) > 0
       ) as game_count
FROM game_os AS os
ORDER BY osid;