CREATE TABLE table_694 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What district first elected in 1978?
SELECT "District" FROM table_694 WHERE "First elected" = '1978'
SELECT "District" FROM "table_694" WHERE "First elected" = '1978'