在Sql Server查詢中加入另一個表的聚集表

Question

我有2個表 - AfricanRatings和AfricanRatingsAVG。 AfricanRatingsAVG是查詢的結果：

INSERT INTO AfricanRatingsAVG 
SELECT RecipeID, COUNT(*) AS Count, AVG(Rating) AS RatingAVG 
FROM AfricanRatings 
GROUP BY RecipeID 

此查詢工作正常，當一個新條目被製成AfricanRatingsAfricanRatingsAVG被更新。

使用GridView控件，來自AfricanRatingsAVG的數據在GridView中顯示得很好。我的問題：我想從第三個表中獲取數據，AfricanRecipes也包含在同一個GridView中。 JOIN之後，我嘗試了JOIN，但沒有任何結果。最後兩個聯接企圖是：

SelectCommand="SELECT * 
FROM (SELECT RecipeID, COUNT(*) AS Count, AVG(Rating) AS RatingAVG 
FROM AfricanRatings 
GROUP BY RecipeID ) AS AfricanRatingsAVG 
JOIN (SELECT AfricanRecipes.RecipeID, AfricanRecipes.Category, AfricanRecipes.Name, AfricanRecipes.Description 
FROM AfricanRecipes 
GROUP BY RecipeID ) AS AfricanRecipes ON (AfricanRatingsAVG.RecipeID = AfricanRecipes.RecipeID)" 

和

SelectCommand="SELECT * 
FROM (SELECT RecipeID, COUNT(*) AS Count, AVG(Rating) AS RatingAVG 
FROM AfricanRatings 
GROUP BY RecipeID ) AS AfricanRatingsAVG 
JOIN AfricanRecipes.RecipeID, AfricanRecipes.Category, AfricanRecipes.Name, AfricanRecipes.Description 
FROM AfricanRecipes 
GROUP BY RecipeID AS AfricanRecipes ON (AfricanRatingsAVG.RecipeID = AfricanRecipes.RecipeID)" 

第一個連接上面給出的錯誤信息：列AfricanRecipes.Category是在選擇列表中無效，因爲它不是在聚合函數或包含GROUP BY條款。

第二個連接提供了錯誤信息：

附近有語法錯誤「」

我已經試過幾十以上，沒有運氣加入的變化。任何幫助，將不勝感激。

Answer 1

SELECT 
    AfricanRatingsAVG.*, 
    AfricanRecipes.RecipeID, 
    AfricanRecipes.Category, 
    AfricanRecipes.Name, 
    AfricanRecipes.Description 
FROM (
    SELECT 
     RecipeID, 
     COUNT(*) AS RecipeCount, 
     AVG(Rating) AS RatingAVG 
    FROM AfricanRatings 
    GROUP BY RecipeID 
) AfricanRatingsAVG 
    JOIN AfricanRecipes 
     ON AfricanRatingsAVG.RecipeID = AfricanRecipes.RecipeID