user: Question: What years were actress Nadine Garner on the show?
Columns: ['Actor/actress', 'Character', 'Rank', 'Tenure', 'Episodes']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Noni Hazlehurst', 'Bernice Waverley', 'Commander', '2007–2011', '001–84']
SQL:

assistant: SELECT "Tenure" FROM "Table" WHERE "Actor/actress" = 'Nadine Garner';