本文介绍了GROUP BY 组合/连接一列的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我有一个表格如下:
ID User Activity PageURL
1 Me act1 ab
2 Me act1 cd
3 You act2 xy
4 You act2 st
我想按用户和活动分组，这样我最终会得到类似的结果:
I want to group by User and Activity such that I end up with something like:
User Activity PageURL
Me act1 ab, cd
You act2 xy, st
如您所见，PageURL 列组合在一起，并根据分组由逗号分隔.
As you can see, the column PageURL is combined together separated by a comma based on the group by.
非常感谢您的指点和建议.
Would really appreciate any pointers and advice.
推荐答案
SELECT
[User], Activity,
STUFF(
(SELECT DISTINCT ',' + PageURL
FROM TableName
WHERE [User] = a.[User] AND Activity = a.Activity
FOR XML PATH (''))
, 1, 1, '') AS URLList
FROM TableName AS a
GROUP BY [User], Activity
- SQLFiddle 演示
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