How many people are shown for mens doubles when guo yue played womens singles?
CREATE TABLE table_28138035_20 (mens_doubles VARCHAR, womens_singles VARCHAR)
SELECT COUNT(mens_doubles) FROM table_28138035_20 WHERE womens_singles = "Guo Yue"
### Context: CREATE TABLE table_28138035_20 (mens_doubles VARCHAR, womens_singles VARCHAR) ### Question: How many people are shown for mens doubles when guo yue played womens singles? ### Answer: SELECT COUNT(mens_doubles) FROM table_28138035_20 WHERE womens_singles = "Guo Yue"