mysql - 将两个查询组合成单半径搜索以进行映射

Question

如果可能的话，我需要一些帮助将这些查询合并为一个。用户将在 from 中输入邮政编码。返回应该是邮政编码和距离。

表结构:

邮政编码 |状态|纬度 |经度

SELECT latitude,
        longitude
 INTO   @latitude, @longitude
 FROM   zipcodes
 WHERE  `zipcode` = 36101
 LIMIT  1;

SELECT zipcode,
       ( 3959 * Acos(Cos(Radians(@latitude)) * Cos(Radians(latitude)) * Cos(
                                   Radians(longitude) - Radians(@longitude)) +
                              Sin(Radians(@latitude)) * Sin(Radians(latitude)))
       ) AS
       distance
FROM   zipcodes
HAVING distance < 10
ORDER  BY distance

我的解决方案 我最终将这些作为两个单独的查询进行。

Answer 1

如果您可以尝试以下方法:

SELECT zipcode,
       ( 3959 * Acos(Cos(Radians(A.sel_latitude)) * Cos(Radians(latitude)) * Cos(
                                   Radians(longitude) - Radians(A.sel_longitude)) +
                              Sin(Radians(A.sel_latitude)) * Sin(Radians(latitude)))
       ) AS
       distance
FROM   
    zipcodes,
    (
       SELECT 
          sel_latitude,
          sel_longitude
       FROM   
          zipcodes
       WHERE  
          `zipcode` = 36101
       LIMIT  1
    ) AS A
HAVING distance < 10
ORDER  BY distance;

希望它能在某种程度上有所帮助