Fetch random results form MySQL
If you read the MySQL manual you might have seen the ORDER BY RAND() to randomize the the rows and using the LIMIT 1 to just take one of the rows.
SELECT name FROM random ORDER BY RAND() LIMIT 1;
The reason that ordering by
RAND() can be slow is that you’re forcing the database to actually sort the whole table before returning anything. Just reducing the load to a single table scan is much faster (albeit still somewhat slow).
SELECT name FROM random AS r1 JOIN (SELECT CEIL(RAND() * (SELECT MAX(id) FROM random)) AS id) AS r2 WHERE r1.id >= r2.id ORDER BY r1.id ASC LIMIT 1