user: Question: How many times has Ma Long won the men's singles?
Columns: ['Year Location', 'Mens Singles', 'Womens Singles', 'Mens Doubles', 'Womens Doubles']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2011 Stockholm', 'Ma Long', 'Guo Yan', 'Wang Liqin Yan An', 'Guo Yan Guo Yue']
SQL:

assistant: SELECT COUNT("Mens Doubles") FROM "Table" WHERE "Mens Singles" = 'Ma Long';