Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_79 ( surface VARCHAR, partner VARCHAR, date VARCHAR )

### Question ###
What was the Surface for the Partner of J rgen Melzer, and a Date of July 16, 2011?

### Accurate SQL ###

SELECT surface FROM table_name_79 WHERE partner = "jürgen melzer" AND date = "july 16, 2011"