cittÃ di caltanissetta เล่นบนพื้นผิวใด? ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
What surface was the città di caltanissetta played on?It is not neccessary to use all the tables.
 table_name_22:  (surface [ VARCHAR ] tournament [ VARCHAR) ]
SELECT surface FROM table_name_22 WHERE tournament = "città di caltanissetta"