CREATE TABLE table_58498 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

what is the away team score when the home team is essendon?
SELECT "Away team score" FROM table_58498 WHERE "Home team" = 'essendon'
SELECT "Away team score" FROM "table_58498" WHERE "Home team" = 'essendon'