我有一个包含游戏条目的数据库表:
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| game_id | title | description | entry_time |
--------------------------------------------------------
| 1 | Game 1 | Descript... | yyyy-mm-dd hh:mm:ss |
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| 2 | Game 2 | Descript... | yyyy-mm-dd hh:mm:ss |
--------------------------------------------------------
另一个包含游戏历史:
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| game_id | user_id | entry_time |
-----------------------------------------------
| 1 | 0da89sadf89 | yyyy-mm-dd hh:mm:ss |
-----------------------------------------------
| 1 | f8jsf89vjs9 | yyyy-mm-dd hh:mm:ss |
-----------------------------------------------
| 2 | f8jsf89vjs9 | yyyy-mm-dd hh:mm:ss |
-----------------------------------------------
我试图根据游戏的受欢迎程度从第一张桌子中选择结果。
SELECT games.game_id, games.title, games.description
FROM `games`
JOIN foo_db.game_plays game_plays
ON game_plays.game_id LIKE games.game_id
WHERE games.title LIKE "%game%"
ORDER BY COUNT(game_plays.game_id) DESC, games.entry_time DESC
LIMIT 10
但由于某种原因,只返回一个结果("游戏1和#34;)。
当我删除JOIN
,并按entry_time
排序结果时,两个结果都会按预期返回。
答案 0 :(得分:1)
我做了这个查询。你可以试试吗。
SELECT a.game_id, a.title, a.description, b.total
from games a
JOIN (SELECT game_id, count(user_id) as total from
game_play group by game_id) b
ON a.game_id = b.game_id
AND a.title LIKE '%Game%'
ORDER BY b.total DESC, a.entry time DESC
<强>输出强>
希望它会有所帮助。
答案 1 :(得分:1)
因为在混合JOIN
和GROUP BY
时MySQL有时非常慢,所以核心子查询可能是一个不错的选择:
SELECT games.game_id, games.title, games.description
FROM `games`
WHERE games.title LIKE "%game%"
ORDER BY (
SELECT COUNT(game_plays.game_id)
FROM foo_db.game_plays
WHERE game_plays.game_id = games.game_id
) DESC, games.entry_time DESC
LIMIT 10