human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Date/Location, Mens singles, Womens Singles, U21 Mens, U21 Womens, Mixed Restricted, Mixed Veteran
###Question: When Naomi Owen won the Womens Singles and Ricardo Walther won the Mens Singles, who won the mixed veteran?
gpt
SELECT Mixed Veteran FROM table WHERE Womens Singles = Naomi Owen AND Mens singles = Ricardo Walther