Question: What is the lowest geohash length when the lat bits are less than 7, and the km error of ±2500?
SQL: SELECT MIN("geohash length") FROM "2-15974212-3" WHERE "lat bits" < 7.0 AND "km error" = '±2500';

Question: What is the highest geohash length when the lat error is ±0.00068, and the lat bits larger than 17?
SQL: SELECT MAX("geohash length") FROM "2-15974212-3" WHERE "lat error" = '±0.00068' AND "lat bits" > 17.0;

Question: What is the highest geohash length when there is a ng error of ±0.00017, and a lng bits smaller than 20?
SQL: SELECT MAX("geohash length") FROM "2-15974212-3" WHERE "lng error" = '±0.00017' AND "lng bits" < 20.0;