gridview

Question

i have three database tables.
table1 consists (townid as pk,town name)
table2 consists (phase id as pk,townid ad ck, and phase name)
table3 consists(sectorid as pk,townid ad ck,phaseid as ck, and sector name)

i want to show a gridview, in that gridview i want to show data of table3, but i want that it shows me the secto name, town name, and phase name instead of showing the ids. how is it possible????