CREATE TABLE table_17458 ("Pick #" FLOAT, "Player" CLOB, "Position" CLOB, "Nationality" CLOB, "NHL team" CLOB, "College/junior/club team" CLOB)

How many nationalities are listed for the player Glen Irwin?
SELECT COUNT("Nationality") FROM table_17458 WHERE "Player" = 'Glen Irwin'
SELECT COUNT("Nationality") FROM "table_17458" WHERE "Player" = 'Glen Irwin'