从多个表

时间:2017-06-13 17:15:39

标签: sql sql-server database

**嗨,  我有3张桌子:

users    
certification    
project

我需要为ech用户选择认证列表和项目列表,如:

--------------------------------------------------------------------
userid | fullname |  list of certification | list of project
--------------------------------------------------------------------
1      | xX       | ITIL ,Cisco,..         | PROj 1 ,Proj 2 ...

我试试这个**

select users.fullname,users.team,users.jobtitle,certif= STUFF(
       (SELECT ','+ certifiacte
        FROM dbo.certification a
        INNER JOIN dbo.Users ar ON ar.UserId = a.UserId

        FOR XML PATH('')), 1, 1, ''),porj= STUFF(
       (SELECT ','+ project
        FROM dbo.project a
        INNER JOIN dbo.Users ar ON ar.UserId = a.UserId

        FOR XML PATH('')), 1, 1, '')
 from Users

但问题是我获得了所有行中保存在数据库中的所有认证和项目的列表。但我需要每个用户的项目和认证列表只有他

1 个答案:

答案 0 :(得分:0)

任何时候发生这种情况,都意味着你没有相关性。您的子选择与外部查询无关。

你需要这样做:

select ar.fullname,ar.team,ar.jobtitle,certif= STUFF(
       (SELECT ','+ certifiacte
        FROM dbo.certification a
        WHERE ar.UserId = a.UserId    
        FOR XML PATH('')), 1, 1, ''),porj= STUFF(
       (SELECT ','+ project
        FROM dbo.project a
        WHERE ar.UserId = a.UserId
        FOR XML PATH('')), 1, 1, '')
from Users ar