user: Question: Name the number where population 2010 is 171906
Columns: ['No.', 'Hanyu', 'Tongyong', 'Pe̍h-ōe-jī', 'Chinese', 'Area (km²)', 'No. of villages', 'Population (2010)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Yancheng', 'Yancheng', 'Iâm-tiâⁿ', '鹽埕區', '1.4161', 21.0, 27651.0]
SQL:

assistant: SELECT "No." FROM "Table" WHERE "Population (2010)" = 171906.0;