user: Question: How many people wrote episode 9 in the season that was directed by Ernest Dickerson?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [49.0, 1.0, '" My Bad "', 'Steve Shill', 'Chip Johannessen', 'September26,2010', '1.77']
SQL:

assistant: SELECT COUNT("Written by") FROM "Table" WHERE "Directed by" = 'Ernest Dickerson' AND "No. in season" = 9.0;