user: Question: Which conference is in Portland, Oregon?
Columns: ['Conference', 'Division', 'Team', 'City', 'Home Arena']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Eastern', 'Atlantic', 'Boston Celtics', 'Boston, Massachusetts', 'TD Garden']
SQL:

assistant: SELECT "Conference" FROM "Table" WHERE "City" = 'Portland, Oregon';