คู่ไหนเต้นตลกแล้วได้คะแนน 21 (6 7 8) ไม่จำเป็นต้องใช้ทุกโต๊ะ
Which couple danced a jive and received a score of 21 (6 7 8)?It is not neccessary to use all the tables.
 table_name_98:  (couple [ VARCHAR ] dance [ VARCHAR ] score [ VARCHAR) ]
SELECT couple FROM table_name_98 WHERE dance = "jive" AND score = "21 (6, 7, 8)"