SQL中的“無效的列名”錯誤

Question

此代碼有什么問題？

我收到此錯誤：

無效的列名“距離”

碼：

SELECT 
    Company.CompanyId as Id,
    ( 6371  * acos( cos( radians(47.8423155) ) * cos( radians( Company.Latitude  ) ) * cos( radians( Company.Longitude  ) - radians(35.232933) ) + sin( radians(47.8423155) ) * sin( radians( Company.Latitude ) ) ) ) AS Distance
FROM 
    Company 
INNER JOIN  
    Product ON Company.CompanyId = Product.CompanyId 
WHERE
    Distance< 5000   
ORDER BY
    Distance

Answer 1

根據您使用的rdbms ，某些RDBMS不允許在where和order by列中引用列別名。 只需使用實際的列名：

SELECT      Company.CompanyId as Id,
            Company.VisitCount AS myVisitCount 
FROM        Company
INNER JOIN  Product ON  Company.CompanyId = Product.CompanyId 
WHERE       Company.VisitCount < 5000   
ORDER BY    Company.VisitCount

Answer 2

將選擇內容包裝在子選擇內

   select * from(SELECT 
    Company.CompanyId as Id,
    ( 6371  * acos( cos( radians(47.8423155) ) * cos( radians( Company.Latitude  ) ) * cos( radians( Company.Longitude  ) - radians(35.232933) ) + sin( radians(47.8423155) ) * sin( radians( Company.Latitude ) ) ) ) AS Distance
FROM 
    Company 
INNER JOIN  
    Product ON (Company.CompanyId = Product.CompanyId) 
) AS P
WHERE
    P.Distance< 5000   
ORDER BY
    P.Distance;

內部子查詢返回使用別名Distance進行過濾的函數。