CREATE TABLE table_31964 ("Calls" CLOB, "Frequency" CLOB, "Branding" CLOB, "Format" CLOB, "Timeslot" CLOB, "Group owner" CLOB)

Tell me the format for calls of wrko
SELECT "Format" FROM table_31964 WHERE "Calls" = 'wrko'
SELECT "Format" FROM "table_31964" WHERE "Calls" = 'wrko'