SQL Server : GROUP BY clause to get comma-separated values on multiple columns [duplicate]

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SQL-Server-2008R2

hi i have a table having 5 columns

ID | ReportId  |  Col1 |   Col2   |col3
1     |1            |a     |Cola    |col3a
2     |2            |b     |colb    |col3b
3     |1            |c     |null    |col3c
4     |3            |d     |cold    |col3d
5     |3            |e     |cole    |null

i am trying a query to write a select query where i can get the columns in comma separated way using group by

Output sample

ReportId    |Col1   |Col2          |col3
1            |a,c   |Cola,null     |col3a,col3c
2            |b     |colb          |col3b
3            |d,e   |cold,cole     |col3d,null

please help me with this

Posted 19-Apr-15 23:20pm

Member 9911885

Updated 19-Apr-15 23:34pm

Maciej Los

v2

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Tomas Takac · Answer 1 · 2015-04-20T00:09:00

There is no build-in function in SQL server to aggregate strings. If you cannot shift the logic to your presentation layer, where it naturally belongs btw, then I suggest you do some reading on how to aggregate strings in SQL server. For example here on Code Project: String Aggregation in the World of SQL Server[^].

Be warned though, there is no nice or elegant solution!