CREATE TABLE table_18197 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Status" CLOB, "Opponent" CLOB)

To what district does Bill Hefner belong?
SELECT "District" FROM table_18197 WHERE "Incumbent" = 'Bill Hefner'
SELECT "District" FROM "table_18197" WHERE "Incumbent" = 'Bill Hefner'