SQlite Getting nearest locations (with latitude and longitude)

Question

I have data with latitude and longitude stored in my SQLite database, and I want to get the nearest locations to the parameters I put in (ex. My current location - lat/lng,

Answer 1

In order to increase performance as much as possible I suggest improve @Chris Simpson's idea with the following ORDER BY clause:

ORDER BY ( -  * LAT_COL -  * LON_COL + LAT_LON_SQ_SUM)

In this case you should pass the following values from code:

 = center_lat^2 + center_lon^2
 = 2 * center_lat
 = 2 * center_lon

And you should also store LAT_LON_SQ_SUM = LAT_COL^2 + LON_COL^2 as additional column in database. Populate it inserting your entities into database. This slightly improves performance while extracting large amount of data.