user: Question: What is the Episode number of Ernest Dickerson in 2009 when the show was Dexter?
Columns: ['Year', 'Show', 'Season', 'Episode', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2012.0, 'The Walking Dead', '3', '16', '31 March 2013']
SQL:

assistant: SELECT "Episode" FROM "Table" WHERE "Year" = 2009.0 AND "Show" = 'Dexter';