string concatenate in group by function with other aggregate functions

Question

Is it possible to concatenate strings with one or more of other group by function like sum, avg, count etc .

Say I have the following table

Id Name O         


        

Answer 1

Try using this.

• I placed your original query in a CTE.
• Then I selected from it, and grouped by the order.
• Then I cross applied with a subquery that gets a comma-delimited set of names for each order in the outer query.
• Since I also selected the names column, I had to also group by the names column.

Like this:

;WITH cte(id, n, o, v) as (
   SELECT Id, Name, Order, Value FROM ....
)
SELECT o, names, SUM(v), COUNT(*)
FROM cte AS outer
CROSS APPLY (
    SELECT Name+',' 
    FROM cte AS inner 
    WHERE outer.o = inner.o 
    ORDER BY Name FOR XML PATH('')
) n(names)
group by o, names