สโมสรใดมีสนามเหย้าไม่มี?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Which club, had a home ground of n/a?It is not neccessary to use all the tables.
 table_63931:  "Club" [ text]  "League/Division" [ text]  "Location" [ text] 
SELECT "Club" FROM table_63931 WHERE "Home Ground" = 'n/a'