谢谢大家对我第一次尝试的帮助
我正在尝试将第二个 group_concat 添加到查询中，以将数据返回到 VB.Net 数据网格。我想将 2 列的结果汇总到如下所示的新列中：
现有数据
Date Sponsor Match_no Team
--------------------------------------------
1-1-11 Nike 1 Tigers
1-1-11 Nike 1 Bears
2-1-11 Crisco 2 Llamas
2-1-11 Crisco 2 Tigers
Date Sponsor Match_no Tags
--------------------------------------------
1-1-11 Nike 1 Away
1-1-11 Nike 1 Rained out
2-1-11 Crisco 2 Home
2-1-11 Crisco 2 Injury
并使用 GROUP_CONCATs 将两列向上滚动以获得类似这样的结果
Date Sponsor Match_no Teams_playing Tags
----------------------------------------------------------------
1-1-11 Nike 1 Tigers vs Bears Away, Rained Out
2-1-11 Crisco 2 Llamas vs Tigers Home, injury
我在这里听取了某人的建议，并在 Team_matches 和 Matches_tags 上创建了连接表
现在有7张桌子：
Dates Sponsors Match Team Tags matches_tags team_matches
--------------------------------------------------------------------------------------
Date_id Sponsor_id Match_id Team_id Tag_id Match_id Team_id
Date Sponsor_name Match_no Team_name Tag_name Tag_id Match_id
date_id sponsor_id
到目前为止，我的查询是：
select d.date, s.sponsor_name, m.match_no,
group_concat(t.team_name separator ' vs ') Teams_playing,
group_concat(tg.tag_name separator ' , ') Comments
from matchs m
inner join matches_teams mte on mte.match_id = m.match_id
inner join matches_tags mta on mta.match_id = m.match_id
inner join team t on t.team_id = mte.team_id
inner join tags tg on tg.tag_id = mta.tag_id
inner join sponsors s on s.sponsor_id = m.sponsor_id
inner join dates d on d.date_id = s.date_id
group by m.match_id, d.date, s.sponsor_name, m.match_no, tg.tag_id
并返回结果：
date sponsor match_no teams playing comments
--------------------------------------------------------------------
1-1-11 Nike 1 Bears vs Tigers Rained out , Rained out
1-1-11 Nike 1 Bears vs Tigers Cancelled , Cancelled
1-1-11 Nike 3 Earwigs vs Goombas Away , Away
2-1-11 Crisco 2 Tigers vs Llamas Away , Away
这不是我所追求的：