user: Question: What is the date that the away team scored 4.7 (31)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '20.6 (126)', 'St Kilda', '7.12 (54)', 'Corio Oval', 9500.0, '9 May 1931']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team score" = '4.7 (31)';