เขตใดมีผู้นำประชาธิปไตยจากโรบี้?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What district has a democratic leader from Roby?It is not neccessary to use all the tables.
 table_name_37:  (district [ INTEGER ] party [ VARCHAR ] home_town [ VARCHAR) ]
SELECT SUM(district) FROM table_name_37 WHERE party = "democratic" AND home_town = "roby"