user: Question: Who played as the away team when Essendon was the home team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '7.9 (51)', 'Richmond', '11.19 (85)', 'Arden Street Oval', 9374.0, '10 August 1968']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Home team" = 'Essendon';