user: Question: what is the total number of population where census designated place is Westmont?
Columns: ['Rank', 'Census-designated place', 'Metropolitan area', 'State', 'Population (2000 census)', 'Land area (mi 2 )', 'Population density (people per mi 2 )']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [1.0, 'Friendship Village', 'Washington, D.C.', 'Maryland', 4512.0, '0.06', '81991.7']
SQL:

assistant: SELECT SUM("Population (2000 census)") FROM "Table" WHERE "Census-designated place" = 'Westmont';