mysql - 修复对 mysql 的查询

Question

我需要从另一个表的结果更新表。 我有几张 table

   Table people

    |id|level| 
      1   0 
      2   0 
      3   0

和 table 上游戏

|id | idman | win_or_lose | game |
    1     1        win        1
    2     2        lose       1
    3     1        win        2
    4     3        lose       2
    5     2        win        3
    6     3        lose       3

我需要创建查询以更改表 people 中的级别。 我尝试使用此查询。但这是错误的。请帮我解决这个问题。

我的查询。

UPDATE people p, 
(select count(id) as count
from games where and idman = p.id and win_or_lose = 'win') g
SET p.level = g.count 

Answer 1

我会这样做:(Fiddle: http://sqlfiddle.com/#!2/1c29e/1/0 )

update people p join (select idman, count(*) as max_game
                        from games
                       where win_or_lose = 'win'
                       group by idman) x on p.id = x.idman
   set p.level = x.max_game