CREATE TABLE table_name_71 (purpose VARCHAR2, band VARCHAR2, callsign VARCHAR2)

Band of am, and a Callsign of 6wh has what purpose?
SELECT purpose FROM table_name_71 WHERE band = "am" AND callsign = "6wh"
SELECT "purpose" FROM "table_name_71" WHERE "6wh" = "callsign" AND "am" = "band"