ใครคือผู้ดำรงตำแหน่งในเขตแมสซาชูเซตส์7?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Who is the incumbent in district Massachusetts7?It is not neccessary to use all the tables.
 table_18206:  "District" [ text]  "Incumbent" [ text]  "Party" [ text]  "Status" [ text]  "Opponent" [ text] 
SELECT "Incumbent" FROM table_18206 WHERE "District" = 'Massachusetts7'