Question

我想计算我的ReviewDetails.Review列，但是我收到了错误：

Column＆＃39; AdvertiserMaster.AdvertiserID＆＃39;在选择列表中无效因为它不包含在聚合函数或 GROUP BY子句。

这是我的查询

SELECT DISTINCT 
AdvertiserMaster.AdvertiserID, AdvertiserMaster.BusinessName , ISNULL(AdvertiserMaster.AverageRating, 0) AS AverageRating, AdvertiserMaster.ImageURL1, AdvertiserMaster.Address1, 
AdvertiserMaster.CategoryID, AdvertiserMaster.Email, AdvertiserMaster.CountryID, AdvertiserMaster.StateID, AdvertiserMaster.CityID, AdvertiserMaster.PinCode, AdvertiserMaster.Mobile, 
CategoryMaster.CategoryName, CountryMaster.CountryName, StateMaster.StateName, CityMaster.CityName,Count(ReviewDetails.Review) AS ReviewCount
FROM AdvertiserMaster INNER JOIN
BusinessCategoryDetails ON AdvertiserMaster.AdvertiserID = BusinessCategoryDetails.AdvertiserID INNER JOIN
ReviewDetails ON AdvertiserMaster.AdvertiserID = ReviewDetails.AdvertiserID LEFT OUTER JOIN
CategoryMaster ON AdvertiserMaster.CategoryID = CategoryMaster.CategoryID LEFT OUTER JOIN
CountryMaster ON AdvertiserMaster.CountryID = CountryMaster.CountryID LEFT OUTER JOIN
CityMaster ON AdvertiserMaster.CityID = CityMaster.CityID LEFT OUTER JOIN
StateMaster ON AdvertiserMaster.StateID = StateMaster.StateID LEFT OUTER JOIN
SubCategoryMaster ON BusinessCategoryDetails.SubCategoryID = SubCategoryMaster.SubCategoryID
WHERE (AdvertiserMaster.CategoryID = 8) AND (AdvertiserMaster.CityID = 16619) AND (AdvertiserMaster.IsActive = 1)

因为我试图通过编写Count（ReviewDetails.Review）

来计算

但这没用。

这是我的表格：ClassifiedBD Images

Answer 1

如果你想计算某些东西（或者使用像sum这样的其他聚合函数），你需要用group by子句定义你的计数级别，例如：

SELECT
  AdvertiserMaster.AdvertiserID,
  AdvertiserMaster.BusinessName,
  ISNULL(AdvertiserMaster.AverageRating, 0) AS AverageRating,
  AdvertiserMaster.ImageURL1,
  AdvertiserMaster.Address1,
  AdvertiserMaster.CategoryID,
  AdvertiserMaster.Email,
  AdvertiserMaster.CountryID,
  AdvertiserMaster.StateID,
  AdvertiserMaster.CityID,
  AdvertiserMaster.PinCode,
  AdvertiserMaster.Mobile,
  CategoryMaster.CategoryName,
  CountryMaster.CountryName,
  StateMaster.StateName,
  CityMaster.CityName,
  COUNT(ReviewDetails.Review) AS ReviewCount
FROM AdvertiserMaster
INNER JOIN BusinessCategoryDetails
  ON AdvertiserMaster.AdvertiserID = BusinessCategoryDetails.AdvertiserID
INNER JOIN ReviewDetails
  ON AdvertiserMaster.AdvertiserID = ReviewDetails.AdvertiserID
LEFT OUTER JOIN CategoryMaster
  ON AdvertiserMaster.CategoryID = CategoryMaster.CategoryID
LEFT OUTER JOIN CountryMaster
  ON AdvertiserMaster.CountryID = CountryMaster.CountryID
LEFT OUTER JOIN CityMaster
  ON AdvertiserMaster.CityID = CityMaster.CityID
LEFT OUTER JOIN StateMaster
  ON AdvertiserMaster.StateID = StateMaster.StateID
LEFT OUTER JOIN SubCategoryMaster
  ON BusinessCategoryDetails.SubCategoryID = SubCategoryMaster.SubCategoryID
WHERE (AdvertiserMaster.CategoryID = 8)
AND (AdvertiserMaster.CityID = 16619)
AND (AdvertiserMaster.IsActive = 1)
GROUP BY AdvertiserMaster.AdvertiserID,
         AdvertiserMaster.BusinessName,
         ISNULL(AdvertiserMaster.AverageRating, 0),
         AdvertiserMaster.ImageURL1,
         AdvertiserMaster.Address1,
         AdvertiserMaster.CategoryID,
         AdvertiserMaster.Email,
         AdvertiserMaster.CountryID,
         AdvertiserMaster.StateID,
         AdvertiserMaster.CityID,
         AdvertiserMaster.PinCode,
         AdvertiserMaster.Mobile,
         CategoryMaster.CategoryName,
         CountryMaster.CountryName,
         StateMaster.StateName,
         CityMaster.CityName

当你有分组时，你不需要明白。

您也可能希望开始使用表的别名并正确格式化/缩进SQL

使用join计算C＃中的列

1 个答案: