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这个问题很烦人，因为我还没有掌握在 sql 中使用中间表的窍门。但是我赶时间，所以我还是选择了问。

我希望将这些 sql 代码组合起来，这样我就可以在同一个中继器中从“老师”以及“团队”和“级别”中检索数据。

我正在通过中间表“teacher_team”中的 FK_teacher 从“teacher”表中获取名称，该中间表通过 FK_team 与我的团队表相关

是否有可能将这些组合起来，以便我可以通过一个中继器将它们全部提取出来？

// Team <-> level relation

SELECT 
team.team_id as team_id,
level.level as level,
FROM team
INNER JOIN level ON level.level_id = team.team_FK_level
WHERE team.team_FK_type = @id


// Team <-> Team_Teacher <-> Teacher relation

SELECT teacher.teacher_name as name 
FROM teacher WHERE teacher.teacher_id 
IN (
SELECT teacher_team.FK_teacher
FROM teacher_team 
INNER JOIN team ON team.team_id = teacher_team.FK_team
WHERE team.team_FK_type = @id
)

* 编辑 * 根据 Ravi Singh 的回答让这个代码工作。我遇到了另一个问题。如果teacher_teams 中有两位老师与之相关，我的转发器将输出两次团队行（当然）。有什么办法可以合并这些而不在中继器内制作中继器？

SELECT 
team.team_id as team_id,
level.level as level,
teacher_team.FK_teacher,
teacher.teacher_name as teacher
FROM team
INNER JOIN level ON level.level_id = team.team_FK_level
LEFT JOIN teacher_team on teacher_team.FK_hold = team.team_id
LEFT JOIN teacheron teacher.teacher_id = teacher_team.FK_teacher
WHERE team.team_FK_type = @id
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1 回答 1

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尝试这个 ：

SELECT 
teacher.teacher_name as name 
,team.team_id as team_id
,level.level as level
FROM teacher 
inner join teacher_team on teacher.teacher_id =teacher_team.FK_teacher
INNER JOIN team ON team.team_id = teacher_team.FK_team
INNER JOIN level ON level.level_id = team.team_FK_level
WHERE team.team_FK_type = @id

更新： 这应该有助于您更新的问题：

with demo_cte as(
SELECT 
teacher.teacher_name as name 
,team.team_id as team_id
,level.level as level
FROM teacher 
inner join teacher_team on teacher.teacher_id =teacher_team.FK_teacher
INNER JOIN team ON team.team_id = teacher_team.FK_team
INNER JOIN level ON level.level_id = team.team_FK_level
WHERE team.team_FK_type = @id
)


select distinct t1.team_id,
  t1.level, 
  STUFF(
         (SELECT ', ' + t2.name
          FROM demo_cte t2
          where t1.team_id = t2.team_id
            and t1.level = t2.level

          FOR XML PATH (''))
          , 1, 1, '')  AS name
from demo_cte t1;
于 2013-06-12T12:07:34.470 回答