CREATE TABLE table_18639 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

In how many districts is the incumbent Dave E. Satterfield, Jr.
SELECT COUNT("Result") FROM table_18639 WHERE "Incumbent" = 'Dave E. Satterfield, Jr.'
SELECT COUNT("Result") FROM "table_18639" WHERE "Incumbent" = 'Dave E. Satterfield, Jr.'