CREATE TABLE table_30610 ("Callsign" CLOB, "City of license" CLOB, "Virtual channel" CLOB, "Digital channel" CLOB, "Network" CLOB)

How many networks run on virtual channel 23.4?
SELECT COUNT("Network") FROM table_30610 WHERE "Virtual channel" = '23.4'
SELECT COUNT("Network") FROM "table_30610" WHERE "Virtual channel" = '23.4'