user: ### NOW ANSWER:
Question: Which women's single had Cai Jaini Qi Yu on the women's doubles team?
Columns: ['Year', "Men's singles", "Women's singles", "Men's doubles", "Women's doubles", 'Mixed doubles']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1995', 'Shen Yifeng', 'Yu Yu Wang', 'Plamen Peev Tzvetozar Kolev', 'Andrea Dako Adrienn Kocsis', 'Zhou Yifeng Yu Yu Wang']
SQL:

assistant: SELECT "Women's singles" FROM "Table" WHERE "Women's doubles" = 'Cai Jaini Qi Yu';