Name the number of womens singles for 1999 rio de janeiro
CREATE TABLE table_28138035_4 (womens_singles VARCHAR, year_location VARCHAR)
SELECT COUNT(womens_singles) FROM table_28138035_4 WHERE year_location = "1999 Rio de Janeiro"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28138035_4 (womens_singles VARCHAR, year_location VARCHAR) Question: Name the number of womens singles for 1999 rio de janeiro [/INST] SELECT COUNT(womens_singles) FROM table_28138035_4 WHERE year_location = "1999 Rio de Janeiro" </s>