CREATE TABLE table_3442 ("Actor/Actress" TEXT, "Character" TEXT, "First Appearance" TEXT, "Last Appearance" TEXT, "Duration" TEXT, "Total" FLOAT)

Who was the actor/actress with a last appearance of 1 january 2010 and total is 20 and character is vanessa 'nessa' jenkins?
SELECT "Actor/Actress" FROM table_3442 WHERE "Last Appearance" = '1 January 2010' AND "Total" = '20' AND "Character" = 'Vanessa ''Nessa'' Jenkins'
SELECT "Actor/Actress" FROM "table_3442" WHERE "Character" = 'Vanessa \'Nessa\' Jenkins' AND "Last Appearance" = '1 January 2010' AND "Total" = '20'