Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_28138035_6 ( womens_doubles VARCHAR, womens_singles VARCHAR, mens_singles VARCHAR )

### Question ###
How many times did li ju win the womens singles and wang liqin win the mens singles?

### Accurate SQL ###

SELECT COUNT(womens_doubles) FROM table_28138035_6 WHERE womens_singles = "Li Ju" AND mens_singles = "Wang Liqin"