Dave E. Satterfield Jr. ผู้ดำรงตำแหน่งอยู่ในเขตกี่เขต ไม่จำเป็นต้องใช้ตารางทั้งหมด
In how many districts is the incumbent Dave E. Satterfield, Jr.It is not neccessary to use all the tables.
 table_18639:  "District" [ text]  "Incumbent" [ text]  "Party" [ text]  "Result" [ text]  "Candidates" [ text] 
SELECT COUNT("Result") FROM table_18639 WHERE "Incumbent" = 'Dave E. Satterfield, Jr.'