CREATE TABLE table_30099 ("Branding" CLOB, "Callsign" CLOB, "Frequency" CLOB, "Power kW" CLOB, "Coverage" CLOB)

Name the callsign for davao mindanao region
SELECT "Callsign" FROM table_30099 WHERE "Coverage" = 'Davao Mindanao Region'
SELECT "Callsign" FROM "table_30099" WHERE "Coverage" = 'Davao Mindanao Region'