Question

I am trying to return voice messages from a database using this query :

SELECT m.mid, 
       m.uid, 
       m.latitude, 
       m.longitude, 
       m.user_rating, 
       m.created_at 
FROM application_Message AS m 
WHERE 
      m.longitude BETWEEN 34.657646284846685 AND 35.342353715153315 AND 
      m.latitude BETWEEN 44.757919366450686 AND 45.242080633549314;

and the database has this in it :

+--------------+---------------+---------+-------+----------+-----------+---------------------+-------------+
| mid          | uid           | message | speed | latitude | longitude | created_at          | user_rating |
+--------------+---------------+---------+-------+----------+-----------+---------------------+-------------+
| 158749857936 | 3425635465657 |   |   5.5 |       35 |        45 | 2011-10-10 00:00:00 |           7 |
| 158749857910 | 3425635465699 |   |  10.5 |       35 |        45 | 2012-11-11 00:00:00 |          10 |
| 158749857905 | 3425635465699 |   |  12.5 |       35 |        45 | 2012-11-11 00:00:00 |          10 |
+--------------+---------------+---------+-------+----------+-----------+---------------------+-------------+

Any ideas on why I am getting an empty set. I tried running it with between 0 and 100 and it works why doesn’t it work if the values are closer to the ones I am looking for? I am not getting any sql errors.

Here is the table description:

+-------------+---------------+------+-----+-------------------+-------+
| Field       | Type          | Null | Key | Default           | Extra |
+-------------+---------------+------+-----+-------------------+-------+
| mid         | decimal(39,0) | NO   | PRI | NULL              |       |
| uid         | decimal(39,0) | NO   |     | NULL              |       |
| message     | blob          | NO   |     | NULL              |       |
| speed       | float         | YES  |     | NULL              |       |
| latitude    | double        | NO   |     | NULL              |       |
| longitude   | double        | NO   |     | NULL              |       |
| created_at  | timestamp     | NO   |     | CURRENT_TIMESTAMP |       |
| user_rating | int(11)       | NO   |     | NULL              |       |
+-------------+---------------+------+-----+-------------------+-------+

Answer 1

Your lat/long data are 35/45 and your query is looking for lat/long ~45/~35. That is, you’ve got lat and long backwards in either data or SQL WHERE clause (at least, that’s what it looks like on a mobile screen).