วันไหนมีคะแนน 5-1 ไม่จำเป็นต้องใช้ทุกโต๊ะ
Which date had a score of 5-1?It is not neccessary to use all the tables.
 table_name_20:  (date [ VARCHAR ] score [ VARCHAR) ]
SELECT date FROM table_name_20 WHERE score = "5-1"