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_42721 ( "Outcome" text, "Date" text, "Surface" text, "Partner" text, "Opponents" text, "Score" text )

### Question ###
What is the Outcome when christophe rochus was partner, on 31 july 2005?

### Accurate SQL ###

SELECT "Outcome" FROM table_42721 WHERE "Partner" = 'christophe rochus' AND "Date" = '31 july 2005'