mysql - 如何在 mysql 中运行子查询

Question

我正在尝试从查询中的另一个表运行子查询

我的查询如下:

SELECT *, (6371000 * acos(cos(radians(select point_oi.lng
                                     from point_oi
                                     where point_oi.name like '%Main Square%')
                            ) 
* cos(radians(restaurants.lat)) * cos(radians(restaurants.lng) 
- radians(select point_oi.lng
         from point_oi
         where point_oi.name like '%Main Square%'
        )) 
+ sin(radians(select point_oi.lng
             from point_oi
             where point_oi.name like '%Main Square%'))
* sin(radians(restaurants.lat)))) AS distance
FROM restaurants
HAVING distance < 500;

当我运行查询时，我收到一条错误消息，指出 select 附近存在错误。 我想使用嵌套选择查询从另一个表获取纬度和经度，而不是对值进行硬编码。 我该如何解决这个问题。

感谢您的帮助

Answer 1

如果 suquery 返回多于一行，则出现错误，则不应使用子查询来检索 point_poi lat, lnt ..

尝试使用正确的连接(在这种情况下，FATC 是否在 point_poi 和餐厅之间没有关系，您可以使用交叉连接)

  SELECT restaurants.*, 
    (6371000 * acos(cos(radians(point_oi.lng )) 
  * cos(radians(restaurants.lat)) * cos(radians(restaurants.lng) 
  - radians(point_oi.lng )) 
  + sin(radians(point_oi.lng ))
  * sin(radians(restaurants.lat)))) AS distance
  FROM restaurants
  CROSS JOIN point_oi 
  WHERE   point_oi.name like '%Main Square%'
  AND (6371000 * acos(cos(radians(point_oi.lng )) 
  * cos(radians(restaurants.lat)) * cos(radians(restaurants.lng) 
  - radians(point_oi.lng )) 
  + sin(radians(point_oi.lng ))
  * sin(radians(restaurants.lat)))) < 500;