Urgent multiple column sorting

can anybody tell me how the multiple column sorting is done

for example if i have a table with data

aa ab bd ap

ef ac ak ef

ef afpa ea

ab cd pp ac

how will be the data if i sort table col1 in ascending and col3 in descending order

please send any thing related to this am urgently in need of it

[344 byte] By [sri_icsa] at [2007-10-3 10:31:03]