Question

I have a forum-like site, which allows users to post. I want users to be able to delete their post ONLY if it is the last for this topic:

Posts Table

+--+-------+------+------+------+--------+
|id|content|author|posted|edited|question|
+--+-------+------+------+------+--------+

How to check is this post is the last post on this question?

Answer 1

This for select max id:

SELECT MAX( id ) FROM tablename 

and for select the id of the last post of an author:

SELECT MAX(id) WHERE author='something'