user: Question: What is the highest geohash length when the lat error is ±0.00068, and the lat bits larger than 17?
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 "lat error" = '±0.00068' AND "lat bits" > 17.0;