user: Question: What is the traditional with density of 820?
Columns: ['English Name', 'Simplified', 'Traditional', 'Pinyin', 'Area', 'Population', 'Density']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['Liangyuan District', '梁园区', '梁園區', 'Liángyuán Qū', 673.0, 787931.0, 1171.0]
SQL:

assistant: SELECT "Traditional" FROM "Table" WHERE "Density" = 820.0;