user: Question: How many people were present in a total of every crowd at the MCG venue?
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', '15.21 (111)', 'North Melbourne', '3.9 (27)', 'MCG', 12075.0, '11 June 1927']
SQL:

assistant: SELECT SUM("Crowd") FROM "Table" WHERE "Venue" = 'MCG';