How to get RANDOM records from each category in MySQL?

Question

In my MySQL database, I have a table with different questions in different categories.

I would like to write a SQL statement that returns 3 RANDOM questions of EACH

Answer 1

In addition to the other answer, this is also another way to do it.

SELECT r.* FROM random r
WHERE (
  SELECT COUNT(*) FROM random r1
  WHERE r.category = r1.category AND r.id < r1.id
) <= 2
ORDER BY r.category ASC, RAND()