Join operation in Haversine formula

Question

I am implementing Haversine formula in PHP as the follows

$result=mysqli_query($mysqli,\"SELECT *,( 6371 * acos( cos( radians({$lat}) ) * cos( radians( `latitude         


        

Answer 1

In this case, put the first query as a derived subquery in the second:

SELECT  p.*, f.*    -- Select only the columns you need, not all
    FROM  
    (
        SELECT  *,
                ( 6371 * acos( cos( radians({$lat}) ) * cos( radians( `latitude` ) )
                  * cos( radians( `longitude` ) -radians({$lon}) )
                  +sin( radians({$lat}) ) * sin( radians( `latitude` ) ) )
                ) AS distance
            FROM  `places`
            HAVING  distance <= {$radius}
            ORDER BY  distance ASC"
            LIMIT 10               -- Didn't you forget this??
    ) AS p
    JOIN  my_friends AS f  ON f.personal_id p.personal_id
      AND  id='".$rest_time."'"     -- Huh??