組一欄CSV

Question

我想獲取資源和相關技能，我想問一問是否可以將技能分組在一個列中，就像CSV這樣

ID技能
1，閱讀，寫作2，編程，閱讀

SELECT     Resources.Id, Skills.Description
FROM         Resources INNER JOIN
                      Skills_Resources ON Resources.Id = Skills_Resources.ResourceID INNER JOIN
                      Skills ON Skills_Resources.skillID = Skills.Id

Answer 1

為了將多個行連接在一起，您將需要使用FOR XML PATH ：

SELECT distinct r.Id, 
    STUFF(
         (SELECT ', ' + cast(s.description as varchar(50))
          FROM Skills s
          INNER JOIN Skills_Resources sr
            ON sr.skillID = s.Id
          where r.Id = sr.ResourceID 
          FOR XML PATH (''))
          , 1, 1, '')  AS skills
FROM Resources r;

請參閱帶有演示的SQL Fiddle 。

您還可以將CROSS APPLY與FOR XML PATH ：

select distinct r.Id,  
  left(s.skill, len(s.skill)-1) skills
from Resources r
cross apply
(
  select s.description + ', '
  FROM Skills s
  INNER JOIN Skills_Resources sr
    ON sr.skillID = s.Id
  where r.Id = sr.ResourceID 
  FOR XML PATH('')
) s (skill);

參見帶有演示的SQL Fiddle