ปีไหนมีรอบ 17 ทีม?ไม่จำเป็นต้องใช้ทุกโต๊ะ
Which year has a Round of 17?It is not neccessary to use all the tables.
 table_name_2:  (year [ VARCHAR ] round [ VARCHAR) ]
SELECT year FROM table_name_2 WHERE round = "17"