Question

我的表格如下：

tbl_teams
id, teamname, created

tbl_teamstats
id, rank, rating, wins, losses, tbl_teams_id, created

我想基于tbl_teamstats“创建desc limit 1”将这两个表合并在一起例如查询

SELECT TS.*, T.* FROM tbl_teamstats as TS
LEFT JOIN tbl_teams as T
ON T.id = TS.tbl_teams_id

会返回类似这样的内容

TS.id   TS.rank TS.rating   TS.wins TS.losses   T.id    T.teamname              T.created
14871   2       2522        168     26          2       teamname1               23/02/2017 17:55
14688   2       2540        168     25          2       teamname1               23/02/2017 17:55
2683    2       2535        167     25          2       teamname1               23/02/2017 17:55
2612    2       2529        166     25          2       teamname1               23/02/2017 17:55
2590    2       2523        165     25          2       teamname1               23/02/2017 17:55
2448    2       2517        164     25          2       teamname1               23/02/2017 17:55
2346    2       2511        163     25          2       teamname1               23/02/2017 17:55
234     2       2505        162     25          2       teamname1               23/02/2017 17:55
1       1       2570        171     19          1       teamname2               23/02/2017 17:55

我希望它看起来像：

TS.id   TS.rank TS.rating   TS.wins TS.losses   T.id    T.teamname              T.created
14871   2       2522        168     26          2       teamname1               23/02/2017 17:55
1       1       2570        171     19          1       teamname1               23/02/2017 17:55

（仅显示TS.id订购的tbl_teamstat的一个结果）

有人可以帮助我或指出我正确的方向吗？非常感谢！

Answer 1

您可以在子查询中找到tbl_team_id的每个tbl_teamstats的最大ID，并将其与tbl_teamstats一起加入。然后，根据需要进行连接。

select *
from (
    select t1.*
    from tbl_teamstats t1
    join (
        select tbl_teams_id,
            max(id) id
        from tbl_teamstats
        group by tbl_teams_id
        ) t2 on t1.tbl_teams_id = t2.tbl_teams_id
        and t1.id = t2.id
    ) ts
left join tbl_teams as T on T.id = TS.tbl_teams_id

Answer 2

在最后添加GROUP BY子句

SELECT TS.*, T.* FROM tbl_teamstats as TS
LEFT JOIN tbl_teams as T
ON T.id = TS.tbl_teams_id
GROUP BY TS.rank

将两个表和多个结果连接在一个表中

2 个答案: