user: Question: When the home team was Carlton how many people were in the crowd?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Melbourne', '11.18 (84)', 'Richmond', '17.19 (121)', 'MCG', 21840.0, '22 April 1939']
SQL:

assistant: SELECT "Crowd" FROM "Table" WHERE "Home team" = 'Carlton';