CREATE TABLE table_79214 ("Actor" TEXT, "Character" TEXT, "Soap Opera" TEXT, "Years" TEXT, "Duration" TEXT)

Which actor played Harold Bishop for 17 years?
SELECT "Actor" FROM table_79214 WHERE "Duration" = '17 years' AND "Character" = 'harold bishop'
SELECT "Actor" FROM "table_79214" WHERE "Character" = 'harold bishop' AND "Duration" = '17 years'