Question

I’m using this simple SQL query to retrieve data from two tables in my MySQL database:

SELECT customer_id, domain_name
FROM customers_orders
INNER JOIN orders ON order_id = sub_id

The result is similar to this:

1114    somedomain.com
1115    anotherdomain.net
1116    domain1.org
1116    domain2.com

How do I tell it to give me an output that is rather similar to:

1114    somedomain.com
1115    anotherdomain.net
1116    domain1.org, domain2.com

So as to avoid having two lines with the same customer_id… I wonder if it is even possible with SQL? I’m a beginner in SQL and I would very much appreciate your help on this.

Thanks a lot!

Answer 1

Try somethin like this

SELECT customer_id, GROUP_CONCAT(domain_name SEPARATOR ',')
FROM customers_orders
INNER JOIN orders ON order_id = sub_id
GROUP BY customer_id