Deleting old MySQL Records

I want to delete old records from my forum so that when someone posts a topic it will delete the topic that is used the lessest

The tablename is "topics" and i want to delete "lastreply"


Thanks

 

DELETE FROM topics ORDER BY lastreply ASC LIMIT 0, 1

 

^^ Maybe I'd add something like WHERE topicid = X as well.

 

But as I understood from the description, he just wants to delete the least used topic. I don't know whether he already knows the particular topic, but if he doesn't, he can only look for the lowest lastreply. And LIMIT 0, 1 ensures that he only deletes one topic, not all of them