user: Question: How many women doubles teams competed in the same year as when Jamie van Hooijdonk competed in men singles?
Columns: ['Season', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2000.0, 'Richard Vaughan', 'Kelly Morgan', 'Chris Rees Neil Cottrill', 'Jo Muggeridge Felicity Gallup', 'Richard Vaughan Kelly Morgan']
SQL:

assistant: SELECT COUNT("Womens doubles") FROM "Table" WHERE "Mens singles" = 'Jamie van Hooijdonk';