group queries result

Hi all, I've to extract data from a mysql db using two different queries and I must have an unique output sorting them alphabetically. For istance, query1: select * from ads where guest='PK'; count the number of results, make the difference between a given number and the number of results (variable $num). query2: select from ads where guest='PK' limit $num; now I have to export all results together sorting them. How can I do that? Can anyone help me? Thanks in advance Barbara --