user: Question: List the number of episodes directed by Linda Mendoza.
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [118.0, 1.0, '"My Mirror Image" (Part 2)', 'John Inwood', 'Tim Hobert', 'November30,2006', 601.0, '8.45']
SQL:

assistant: SELECT COUNT("Production code") FROM "Table" WHERE "Directed by" = 'Linda Mendoza';