CREATE TABLE table_4557 ("Actor/actress" CLOB, "Character" CLOB, "Rank" CLOB, "Tenure" CLOB, "Episodes" CLOB)

What years were actress Nadine Garner on the show?
SELECT "Tenure" FROM table_4557 WHERE "Actor/actress" = 'nadine garner'
SELECT "Tenure" FROM "table_4557" WHERE "Actor/actress" = 'nadine garner'