I have 2 tables: comments & posts. I'd like to display a list of 15 posts and maximum 2 most recent comments under each blog post entry using mysql. 

the database scheme looks like this

```
posts_table: 
post_id, post_txt, post_timestamp

comments_table: 
post_id, comment_txt, comment_timestamp

```

how should the mysql query look in order to select 15 posts and their related comments (max 2 most recent ones per post)?

thanks