ประเภทคู่หญิงมีกี่ปีในการแข่งขัน jing junhong li jiawei?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
How many  year locations are there for the womens doubles in jing junhong li jiawei?It is not neccessary to use all the tables.
 table_28138035_20:  (year_location [ VARCHAR ] womens_doubles [ VARCHAR) ]
SELECT COUNT(year_location) FROM table_28138035_20 WHERE womens_doubles = "Jing Junhong Li Jiawei"