CREATE TABLE table_4739 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the North Melbourne's score when they played as the home team?
SELECT "Home team score" FROM table_4739 WHERE "Home team" = 'north melbourne'
SELECT "Home team score" FROM "table_4739" WHERE "Home team" = 'north melbourne'