Php MySQL-组合两个查询

我无法解决这个问题：

我有很多地理坐标的mysql数据库

我想知道哪些点在特定坐标和距离的特定英里数内 在特定的正方形内

特定区域内的点：

    (SELECT
        *,
        'area' as type,
        ( 3959 * acos( cos( radians(".$Plat.") ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(".$Plng.") ) + sin( radians(".$lat.") ) * sin( radians( lat ) ) ) ) AS distance
    FROM
        ".$db."
    HAVING
        distance < ".$radius."

• id（72）仅存在于区域A中，而不存在于正方形中
• id（81）仅存在于正方形中，而不存在于该区域中
• id（42）在该区域内，也在广场内。所以它出现了两次。但它应该只有一次。该地区应该得到优先考虑

但应该是这样

+------+-----------+-----------+----------+-------------+
|  id  | Alat      | Alng      | distance | type        |
+------+-----------+-----------+----------+-------------+
|  42  | 53.704678 | 10.202164 | 12345    | area  
+------+-----------+-----------+------------------------+
|  72  | 23.704678 | 15.202164 | 12345    | area
+------+-----------+-----------+------------------------+
            ......
+------+-----------+-----------+------------------------+
|  81  | 43.778    | 15.201212 | -1       | square
+------+-----------+-----------+------------------------+
            ......

---

在联合后使用GROUP BY删除重复项

SELECT id, Alat, Alng, distance, type
FROM (
    SELECT *, 'area' as type, ... FROM ...
UNION ALL
    SELECT *, 'square' as type, ... FROM ...
) AS subq
GROUP BY id, Alat, Alng, distance

对于较大的结果集，这可能不是很有效，但应该有效

---

请注意，在SQL标准和许多其他数据库中禁止使用这种分组方式（因为

type

不在分组方式中），但MySQL允许使用这种方式。

请以表格形式提供示例数据和预期结果。

+------+-----------+-----------+----------+-------------+
|  id  | Alat      | Alng      | distance | type        |
+------+-----------+-----------+----------+-------------+
|  42  | 53.704678 | 10.202164 | 12345    | area  
+------+-----------+-----------+------------------------+
|  72  | 23.704678 | 15.202164 | 12345    | area
+------+-----------+-----------+------------------------+
            ......
+------+-----------+-----------+------------------------+
|  81  | 43.778    | 15.201212 | -1       | square
+------+-----------+-----------+------------------------+
            ......

SELECT id, Alat, Alng, distance, type
FROM (
    SELECT *, 'area' as type, ... FROM ...
UNION ALL
    SELECT *, 'square' as type, ... FROM ...
) AS subq
GROUP BY id, Alat, Alng, distance