user: Question: Who was the actor/actress with a last appearance of 1 January 2010 and total is 20 and character is Vanessa 'Nessa' Jenkins?
Columns: ['Actor/Actress', 'Character', 'First Appearance', 'Last Appearance', 'Duration', 'Total']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Mathew Horne', "Gavin 'Gav' Shipman", '13 May 2007', '1 January 2010', '2007–2010', 20.0]
SQL:

assistant: SELECT "Actor/Actress" FROM "Table" WHERE "Last Appearance" = '1 January 2010' AND "Total" = 20.0 AND "Character" = 'Vanessa ''Nessa'' Jenkins';