Complex sql, limit-for-each group by, arrays, updates - Mailing list pgsql-general

So i have (table where data will be read) : 

CREATE TABLE data (vid,cid,pid,number);

Tables where data will be writen/updated:

I need to , possibly in 1 query, this will run once in a while: 

Get top(10) vids , sorted by 'number',grouped by pid and update the row in TABLE(pid_top_vids).

Get top(10) vids, sorted by 'number', grouped by cid and update the row in TABLE(cid_top_vids).

Get top(10) cids, sorted by 'number', where number is the SUM() of each vid GROUP_BY(cid) and update the row in TABLE (cid_top_vids);

So, get data, create sorted array, and update the rows (they exist, so only the arrays have to be updated).

Possible ?

Thanks