確定距離MySQL

Question

我的代碼如下，應該可以工作，但由於某種原因它不能識別連接語句中的wm_stores.lat。有人有主意嗎？

SELECT wm_dcs.dc_id, wm_stores.store_id 
FROM wm_dcs 
JOIN wm_stores 
    ON wm_stores.lat BETWEEN wm_dcs.lat - (250.0/69.0) 
     AND wm_dcs.lat + (250.0/69.0) 
     AND wm_stores.lon BETWEEN wm_dcs.lon - (250.0/(69.0 * COS(RADIANS(wm_dcs.lat)))) 
     AND wm_dcs.lon + (250.0/(69.0 * COS(RADIANS(wm_dcs.lat)))) 
     AND (69.0 * DEGREES(ACOS(COS(RADIANS(wm_dcs.lat) * COS(RADIANS(stores.latitude)) 
      * COS(RADIANS(dc.longitude - stores.longitude)) 
      + SIN(RADIANS(dc.latitude)) 
      * SIN(RADIANS(wm_stores.lon)))))) <= 250.0; 

不同的代碼版本：

set @dc_lat = 40.811973 ; 
set @dc_lon = -73.946299 ; 

select wm_stores.store_id, 
(3959 * acos(cos(radians(@dc_lat)) * cos(radians(wm_stores.lat)) 
* cos(radians(wm_stores.lon) - radians(@dc_lon)) + sin(radians(@dc_lat)) 
* sin(radians(wm_stores.lat)))) AS distance 
from wm_stores 
having distance <= 250 
order by distance asc; 

Answer 1

在查詢

SELECT wm_dcs.dc_id, wm_stores.store_id 
FROM wm_dcs 
JOIN wm_stores 
    ON wm_stores.lat BETWEEN wm_dcs.lat - (250.0/69.0) 
     AND wm_dcs.lat + (250.0/69.0) 
     AND wm_stores.lon BETWEEN wm_dcs.lon - (250.0/(69.0 * COS(RADIANS(wm_dcs.lat)))) 
     AND wm_dcs.lon + (250.0/(69.0 * COS(RADIANS(wm_dcs.lat)))) 
     AND (69.0 * DEGREES(ACOS(COS(RADIANS(wm_dcs.lat) * COS(RADIANS(stores.latitude)) 
      * COS(RADIANS(dc.longitude - stores.longitude)) 
      + SIN(RADIANS(dc.latitude)) 
      * SIN(RADIANS(wm_stores.lon)))))) <= 250.0; 

我注意到有一個像stores沒有桌子，但你已經在你的查詢中使用stores.latitude和stores.longitude。可能是這是導致錯誤消息Unknown column 'stores.latitude' in 'on clause'。

我建議你重新檢查代碼

AND (69.0 * DEGREES(ACOS(COS(RADIANS(wm_dcs.lat) * COS(RADIANS(stores.latitude)) 
      * COS(RADIANS(dc.longitude - stores.longitude)) 
      + SIN(RADIANS(dc.latitude)) 
      * SIN(RADIANS(wm_stores.lon)))))) <= 250.0;