php - Get last post in each category -


i've got 4 tables:

 1. forums (id,forum_id,name,group_id) - there categories ,         sub-categories  2. topics (id,forum_id,user_id,name,dt,deleted[default - 0])  3. posts (id,topic_id,text,edit_dt,user_id,deleted)  4. users (id,name)

what best way main categories last posts? or maybe add in forums table new fields - last_post_id,last_post_name,last_post_dt, , @ delete,add new topic/reply update these fields?

at first, identify "last post" should add timestamp (datetime) posts table.

also, in question, define categories (i presume it's topics) , example of data, paired example of desired output.


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