user: Question: How many races were in the mallala motor sport park circuit?
Columns: ['Race', 'Circuit', 'Location / State', 'Date', 'Winner', 'Team']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Phillip Island Grand Prix Circuit', 'Phillip Island , Victoria', '4–5 March', 'Paul Morris', 'Paul Morris Motorsport']
SQL:

assistant: SELECT COUNT("Race") FROM "Table" WHERE "Circuit" = 'mallala motor sport park';