How to Achieve String Aggregation in SQL Server Before 2017?

Implementing string aggregation before SQL Server 2017

For those using SQL Server 2014 or earlier and want to concatenate strings like the example query:

select 
    string_agg(t.id,',') AS id
from 
    Table t

Here's how you can tailor this query to your environment:

select stuff( (select ',' + cast(t.id as varchar(max))
               from tabel t
               for xml path ('')
              ), 1, 1, ''
            );

In this query, the stuff() function is only used to remove the leading comma. The actual string concatenation is done using for xml path.

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