CREATE TABLE table_23394920_1 (station_type VARCHAR, callsign VARCHAR)

When dxcc-tv is the call sign how many station types are there?
SELECT COUNT(station_type) FROM table_23394920_1 WHERE callsign = "DXCC-TV"
SELECT COUNT("station_type") FROM "table_23394920_1" WHERE "DXCC-TV" = "callsign"