CREATE TABLE table_name_4 (margin VARCHAR, venue VARCHAR, season VARCHAR)

What is the Margin that has a Venue of bellerive oval , hobart, and a Season of 2002/03?
SELECT margin FROM table_name_4 WHERE venue = "bellerive oval , hobart" AND season = "2002/03"
SELECT "margin" FROM "table_name_4" WHERE "2002/03" = "season" AND "bellerive oval , hobart" = "venue"