How many years did lin gaoyuan wu jiaji play  mens doubles?
CREATE TABLE table_28138035_20 (year_location VARCHAR, mens_doubles VARCHAR)
SELECT COUNT(year_location) FROM table_28138035_20 WHERE mens_doubles = "Lin Gaoyuan Wu Jiaji"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28138035_20 (year_location VARCHAR, mens_doubles VARCHAR) Question: How many years did lin gaoyuan wu jiaji play  mens doubles? [/INST] SELECT COUNT(year_location) FROM table_28138035_20 WHERE mens_doubles = "Lin Gaoyuan Wu Jiaji" </s>