Mysql JOIN multiple tables with latitude and longitude - mysql

Question

I'm trying to display advertisements relevant to data of the user.
Here, data is Latitude and longitude.
ADS table: ad to display with ad name, ad text, latitude and longitude
Tables with data of the user:
TABLE1: user id + latitude and longitude,
TABLE2: user id + latitude and longitude,
TABLE3: user id + latitude and longitude,
TABLE4: user id + latitude and longitude
The purpose is to display an ad, when the latitude and longitude of the ad matches the latitude and longtitude of one or more lines in the 4 tables in a range of 10km and limit by 3 results.
It's working when linking one ad with one table in range of 10km, but doesn't with more tables.
- I'm not comfortable with OUTER JOINS -
My query looks like this and I'm pretty sure I'm going wrong...
SELECT ADS.name, ADS.text,
( 6371 * acos( cos( radians(TABLE1.latitude) )
* cos( radians( ADS.latitude ) )
* cos( radians( ADS.longitude )
- radians(TABLE1.longitude) )
+ sin( radians(TABLE1.latitude) )
* sin( radians( ADS.latitude ) ) ) )
AS check1,
( 6371 * acos( cos( radians(TABLE2.latitude) )
* cos( radians( ADS.latitude ) )
* cos( radians( ADS.longitude )
- radians(TABLE2.longitude) )
+ sin( radians(TABLE2.latitude) )
* sin( radians( ADS.latitude ) ) ) )
AS check2,
( 6371 * acos( cos( radians(TABLE3.latitude) )
* cos( radians( ADS.latitude ) )
* cos( radians( ADS.longitude )
- radians(TABLE3.longitude) )
+ sin( radians(TABLE3.latitude) )
* sin( radians( ADS.latitude ) ) ) )
AS check3,
( 6371 * acos( cos( radians(TABLE4.latitude) )
* cos( radians( ADS.latitude ) )
* cos( radians( ADS.longitude )
- radians(TABLE4.longitude) )
+ sin( radians(TABLE4.latitude) )
* sin( radians( ADS.latitude ) ) ) )
AS check4
FROM ADS
RIGHT OUTER JOIN TABLE1
ON TABLE1.user = ?
RIGHT OUTER JOIN TABLE2
ON TABLE2.user = ?
RIGHT OUTER JOIN TABLE3
ON TABLE3.user = ?
RIGHT OUTER JOIN TABLE4
ON TABLE4.user = ?
HAVING check1 < 10 OR check2 < 10 OR check3 < 10 OR check4 < 10
LIMIT 0,3

Answer 1

If user isn't unique in TABLE1 (or any of the TABLEn), then there's a potential to return multiple copies of the same row from ADS.
With the query the way it is, if the specified user isn't found in TABLE4, then the query won't return any rows. I suspect what you meant was a LEFT JOIN, with ADS as the driving table, but that's just a guess. We don't know what those tables contain, why are there four of them, etc.)
If there's a reason you are using a RIGHT JOIN, and if the query with one table is working for you...
and if there is a small number of rows in each of TABLE1, TABLE2, TABLE3, TABLE4 for a specified user...
You could concatenate the results of queries of those tables into single derived table, and then join to the derived table. As an example:
SELECT ADS.name, ADS.text,
( 6371 * acos( cos( radians(t.latitude) )
* cos( radians( ADS.latitude ) )
* cos( radians( ADS.longitude )
- radians(t.longitude) )
+ sin( radians(t.latitude) )
* sin( radians( ADS.latitude ) ) )
) AS check1
FROM ADS
RIGHT
JOIN ( SELECT TABLE1.latitude, TABLE1.longitude
FROM TABLE1 WHERE TABLE1.user = ?
UNION ALL
SELECT TABLE2.latitude, TABLE2.longitude
FROM TABLE2 WHERE TABLE2.user = ?
UNION ALL
SELECT TABLE3.latitude, TABLE3.longitude
FROM TABLE3 WHERE TABLE3.user = ?
UNION ALL
SELECT TABLE4.latitude, TABLE4.longitude
FROM TABLE4 WHERE TABLE4.user = ?
) t
HAVING check1 < 10
LIMIT 3

Answer 2

This was finaly what I needed:
$reponse = $bdd->prepare('
SELECT * FROM
(
SELECT ADS.id AS id, ADS.name, ADS.text,
( 6371 * acos( cos( radians(t.latitude) )
* cos( radians(ADS.latitude ) )
* cos( radians( ADS.longitude )
- radians(t.longitude) )
+ sin( radians(t.latitude) )
* sin( radians( ADS.latitude ) ) ) )
AS distance
FROM ADS
RIGHT
JOIN ( SELECT TABLE1.latitude, TABLE1.longitude
FROM TABLE1 WHERE TABLE1.user = :user
UNION ALL
SELECT TABLE2.latitude, TABLE2.longitude
FROM TABLE2 WHERE TABLE2.user = :user
UNION ALL
SELECT TABLE3.latitude, TABLE3.longitude
FROM TABLE3 WHERE TABLE3.user = :user
UNION ALL
SELECT TABLE4.latitude, TABLE4.longitude
FROM TABLE4 WHERE TABLE4.user = :user
) t
ON 1
HAVING distance < 10
) req GROUP BY id LIMIT 0,3
');
$reponse->execute(array('user' => $_SESSION['id']));