user: Question: Who wrote episode number 19 in the series?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, '"Pilot (The Fresh Prince Project)"', 'Debbie Allen', 'Andy Borowitz & Susan Borowitz', 'September10,1990', 446801.0]
SQL:

assistant: SELECT "Written by" FROM "Table" WHERE "No. in series" = 19.0;