What day did he play on hard with tom mercer?
CREATE TABLE table_name_69 (date VARCHAR, surface VARCHAR, partner VARCHAR)
SELECT date FROM table_name_69 WHERE surface = "hard" AND partner = "tom mercer"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_69 (date VARCHAR, surface VARCHAR, partner VARCHAR) Question: What day did he play on hard with tom mercer? [/INST] SELECT date FROM table_name_69 WHERE surface = "hard" AND partner = "tom mercer" </s>