How many players are there for mens singles when chen qi ma lin played mens doubles?
CREATE TABLE table_28138035_20 (mens_singles VARCHAR, mens_doubles VARCHAR)
SELECT COUNT(mens_singles) FROM table_28138035_20 WHERE mens_doubles = "Chen Qi Ma Lin"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28138035_20 (mens_singles VARCHAR, mens_doubles VARCHAR) Question: How many players are there for mens singles when chen qi ma lin played mens doubles? [/INST] SELECT COUNT(mens_singles) FROM table_28138035_20 WHERE mens_doubles = "Chen Qi Ma Lin" </s>