CREATE TABLE table_1088 ("Call sign" TEXT, "Launched" TEXT, "Transmitting from" TEXT, "Coverage" TEXT, "Languages" TEXT, "Frequency" TEXT)

How many times does the call sign XEZV appear?
SELECT COUNT("Transmitting from") FROM table_1088 WHERE "Call sign" = 'XEZV'
SELECT COUNT("Transmitting from") FROM "table_1088" WHERE "Call sign" = 'XEZV'