我有这3个数据库表
CityTable (List of Cities)
--------
CityCode
CityName
Advertiser (Profile of Advertisers)
----------
AdvertiserCode
AdvertiserName
CityCode
Ads (Transaction Table)
--------
AdsId
AdsTitle
AdsDesc
CityCode
AdvertiserCode
哪里
Ads.CityCode is Where the Ads is being offered
Advertiser.CityCode is Address of the Advertiser
使用此查询，我将只能获取[
Ads]的城市名称SELECT Ads.AdsTitle, Ads.AdsDesc, AdsCity, CityTable.CityName AS AdsCityName
FROM Ads
LEFT JOIN CityTable ON CityTable.CityCode = Ads.CityCode
LEFT JOIN Advertiser ON Advertiser.AdvertiserCode = Ads.AdvertiserCode
但我还需要获取广告商的[CityName]
最佳答案
尝试这个：
SELECT Ads.AdsTitle, Ads.AdsDesc, AdsCity, CityTable.CityName AS AdsCityName, AdvCity.CityName AS AdvertiserCity
FROM Ads
LEFT JOIN CityTable ON CityTable.CityCode = Ads.CityCode
LEFT JOIN Advertiser ON Advertiser.AdvertiserCode = Ads.AdvertiserCode
LEFT JOIN CityTable as AdvCity ON AdvCity.CityCode = Advertiser.CityCode