Grouped string aggregation / LISTAGG for SQL Server

Question

I\'m sure this has been asked but I can\'t quite find the right search terms.

Given a schema like this:

| CarMakeID | CarMake
----------------------         


        

Answer 1

If it is SQL Server 2017 or SQL Server VNext, Azure SQL database you can use String_agg as below:

SELECT  make.CarMakeId, make.CarMake, 
        CarModels = string_agg(model.CarModel, ', ') 
FROM CarModels model
    INNER JOIN CarMakes make 
    ON model.CarMakeId = make.CarMakeId
GROUP BY make.CarMakeId, make.CarMake

Output:

+-----------+-----------+---------------------------+
| CarMakeId |  CarMake  |         CarModels         |
+-----------+-----------+---------------------------+
|         1 | SuperCars | Zoom, Wow, Awesome        |
|         2 | MehCars   | Mediocrity, YoureSettling |
+-----------+-----------+---------------------------+

Answer 2

http://www.simple-talk.com/sql/t-sql-programming/concatenating-row-values-in-transact-sql/

It is an interesting problem in Transact SQL, for which there are a number of solutions and considerable debate. How do you go about producing a summary result in which a distinguishing column from each row in each particular category is listed in a 'aggregate' column? A simple, and intuitive way of displaying data is surprisingly difficult to achieve. Anith Sen gives a summary of different ways, and offers words of caution over the one you choose...