Lin gaoyuan wu jiaji เล่นชายคู่กี่ปี?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
How many years did lin gaoyuan wu jiaji play mens doubles?It is not neccessary to use all the tables.
 table_28138035_20:  year_location [ VARCHAR]  mens_doubles [ VARCHAR] 
SELECT COUNT(year_location) FROM table_28138035_20 WHERE mens_doubles = "Lin Gaoyuan Wu Jiaji"