user: Question: What is the evening gown score of the contestant from the district of columbia with preliminaries smaller than 8.647?
Columns: ['State', 'Preliminaries', 'Interview', 'Swimsuit', 'Evening Gown', 'Average']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Mississippi', 8.852, 9.123, 9.366, 9.343, 9.277]
SQL:

assistant: SELECT "Evening Gown" FROM "Table" WHERE "Preliminaries" < 8.647 AND "State" = 'district of columbia';