Question

我一直在寻找一种方法来显示多个列中的一行，一个单元格。它的内容用逗号分隔。

例如，取代：

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

我希望我的查询结果如下：

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

提前致谢

Answer 1

这比使用pivot更具挑战性，但只是一点点。问题是你没有一个列来指定标签所在的，所以你必须添加它。

以下是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

在sql server 2005中转换列中的行

1 个答案: