Question

I have a “messages” table with the following columns:

• id (primary Key)
• username
• timestamp
• content

I want to get a list of distinct usernames sorted by their latest message. I get the DISTINCT part but don’t know how to make it return the one with the latest timestamp. I only have this so far.

SELECT DISTINCT username FROM messages

Answer 1

I’d approach this slightly differently:

SELECT username 
FROM messages
GROUP BY username
ORDER BY MAX(timestamp)