user: Question: What is the highest geohash length when there is a ng error of ±0.00017, and a lng bits smaller than 20?
Columns: ['geohash length', 'lat bits', 'lng bits', 'lat error', 'lng error', 'km error']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 2.0, 3.0, '±23', '±23', '±2500']
SQL:

assistant: SELECT MAX("geohash length") FROM "Table" WHERE "lng error" = '±0.00017' AND "lng bits" < 20.0;