转换sql server 2005中以列为单位的行

我一直在寻找一种在多个列、一个单元格中显示一行的方法。它的内容由逗号分隔

例如，代替：

ProjectID      Label
————           ——–
1200           label1
1200           label2
1200           label3

我希望我的查询结果如下所示：

ProjectID                      1        2        3
————                   ——– 
1200                          label1  label2, label3

---

提前感谢

这比仅使用

pivot

更具挑战性，但只是一点点。问题是您没有列来指定标签的位置，因此必须添加它

下面是一个使用聚合的解决方案：

with t as (
      select t.*, row_number() over (partition by ProjectId order by label) as seqnum
      from t
)
select ProjectId,
       max(case when seqnum = 1 then label end) as [1],
       max(case when seqnum = 2 then label end) as [2],
       max(case when seqnum = 3 then label end) as [3]
from t
group by ProjectId;

以下是使用pivot的解决方案：

with t as (
      select t.*, row_number() over (partition by ProjectId order by label) as seqnum
      from t
)
select ProjectId, [1], [2], [3]
from t
pivot (max(label) for seqnum in ([1], [2], [3])
      ) as pvt

---

必须创建不使用逗号的独立列有许多关于这方面的文章，如，