user: Question: How many households are in Ottawa?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Roger Mills', '$28,427', '$48,917', '$57,738', 3647.0, 1470.0]
SQL:

assistant: SELECT SUM("Number of households") FROM "Table" WHERE "County" = 'Ottawa';