human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Year, Mens singles, Womens singles, Mens doubles, Womens doubles, Mixed doubles
###Question: In the year 2006, the womens singles had no competition and the mens doubles were roland hilti kilian pfister, what were the womens doubles
gpt
SELECT Womens doubles FROM table WHERE Womens singles = no competition AND Mens doubles = Roland Hilti Kilian Pfister AND Year = 2006