Fehler "Ungültiger Spaltenname" in SQL

Question

Was ist falsch an diesem Code?

ich diesen Fehler:

Invalid column name 'Distance'

Code:

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

Wickeln Sie die Auswahl innerhalb subselect

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; 

Die innere Unterabfrage die Funktion auf Basis gibt, von denen Sie mit dem Alias ​​Entfernung filtern.

Answer 2

auf dem rdbms Je Sie verwenden, einige RDBMS nicht erlauben, zu Spalte Aliase Bezugnahme auf die in den where und order by Spalten . Verwenden Sie einfach die tatsächlichen Spaltennamen:

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