GROUP BY behaviour

[acid]

here is users table 
user_id level username password firstname lastname 
 1 a s Aa Bb 
 2 t tt Brian Adams 
 3 s s Staff4 351 
 4 s s8 Staff3 800 
here is posts table 
post_id ticket_id user_id date 
 7 KSO-60138 1 18.09.2005 0:53:26 
 28 QZU-67195 1 24.09.2005 23:14:48 
 29 ZHK-56918 1 24.09.2005 23:51:01 
 30 QZU-67195 3 24.09.2005 23:52:34 
 27 VXQ-20839 3 24.09.2005 23:11:39 
 26 KSO-60138 3 24.09.2005 23:08:13 
 25 KSO-60138 3 24.09.2005 23:06:09 
 18 VXQ-20839 2 18.09.2005 18:48:23 
here is tickets table 
ticket_id status subject assigned_id 
KSO-60138 CUSTOMERPENDING test 3 
VXQ-20839 NEW testing su 4 
QZU-67195 NEW aaaaaaaaaaa  
ZHK-56918 NEW zzzzzzz  
The author of ticket should be determined by the first post related to the ticket. 
I'm trying to build a query, which will give me  
ticket.*, last post date, last post author and all for the given author(user_id). 
Can I make that using only one query? 
Thanks in advance. 

[edited by: txbakers at 1:12 pm (utc) on Sep. 25, 2005]
[edit reason] removed passwords [/edit]

[coopster]

Welcome to WebmasterWorld, acid.

You have written out the logic in plain text, now simply apply the SQL syntax to it. The only part missing is how to JOIN the tables based on their relation. What do you have so far?

[acid]

Thanks for reply coopster.
The connections as follows.

tickets.ticket_id -> posts.post_id
posts.user_id -> users.user_id
tickets.assigned_id -> users.user_id
last post date -> min(posts.date) WHERE user_id=<userid>

But actually I've already solved it by adding couple columns in tickets table(last post id, ticket author id), which is redundant for sure but that was the only quick way to solve it.

Thanks!