GPS座標MySQL查詢

Question

假設我有$longitude=2;$latitude =3; 我想從數據庫

Select * 
from info 
where longitude is between $longitude + 2 AND $longitude-2 
AND latitude is between $latitude + 2 AND $latitude -2 

獲取信息，我怎麼可以這樣寫查詢來獲取我認爲沃爾德是特定區域

Answer 1

$longitude = 2; 
$latitude = 3; 

$longitude_min = $longitude - 2; 
$longitude_max = $longitude + 2; 
$latitude_min = $latitude - 2; 
$latitude_max = $latitude +2; 

$sql = "SELECT * FROM `info` 
WHERE `longitude`>$longitude_min 
AND `longitude`<$longitude_max 
AND `latitude`>$latitude_min 
AND `latitude`<$latitude_max"; 

$result = mysql_query($sql);