Question: How many households are in Ottawa?
SQL: SELECT SUM("Number of households") FROM "2-1840453-1" WHERE "County" = 'Ottawa';

Question: What county has a population more than 603403 and a mediuan family income of $61,694?
SQL: SELECT "County" FROM "2-1840453-1" WHERE "Population" > 603403.0 AND "Median family income" = '$61,694';