user: Question: What is the total amount of circuts dated 22 April?
Columns: ['Race Name', 'Circuit', 'Date', 'Winning driver', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['II Lombank Trophy', 'Snetterton', '26 March', 'Jack Brabham', 'Cooper - Climax', 'Report']
SQL:

assistant: SELECT COUNT("Circuit") FROM "Table" WHERE "Date" = '22 April';