加入三個表，查詢不按預期在SQLite中工作

Question

我正在構建一個按配料搜索食譜的應用程序。我有5個表：

配方

RecipeId | RecipeTitle | Directions | PrepTime | CookTime 

成分

IngredientId | IngredientName 

類別

CategoryId | CategoryName 

RecipeIngredient結表（很多到很多）

RecipeId | IngredientId | Quantity | UOM | Comments 

RecipeCategory結表（很多到很多）

RecipeId | CategoryId 

我想要做的就是讓用戶選擇的成分是什麼，類別和時間，應用程序將搜索適合用戶輸入的食譜。我正在測試如何使用DB Browser for SQLite在我的應用程序中實現它之前如何工作，但它不像預期的那樣工作。

這裏是我試過的最新查詢（當然我在這裏假設用戶輸入，並且它們不是由他們可以選擇成分和種類的數量限制）：

SELECT RecipeTitle, COUNT(RecipeTitle) AS Ing FROM Recipe 

JOIN RecipeIngredient ON Recipe.RecipeId = RecipeIngredient.RecipeId 
JOIN RecipeCategory ON Recipe.RecipeId = RecipeCategory.RecipeId 

WHERE 
    RecipeIngredient.IngredientId = 
    (SELECT Ingredient.IngredientId FROM Ingredient 
    WHERE Ingredient.IngredientName = "olive oil") 
OR 
    RecipeIngredient.IngredientId = 
    (SELECT Ingredient.IngredientId FROM Ingredient 
    WHERE Ingredient.IngredientName = "beef") 
OR 
    RecipeIngredient.IngredientId = 
    (SELECT Ingredient.IngredientId FROM Ingredient 
    WHERE Ingredient.IngredientName = "parsley") 
AND 
    RecipeCategory.CategoryId = 
    (SELECT Category.CategoryId FROM Category 
    WHERE Category.CategoryName = "Dinner") 
AND 
    Recipe.PrepTime + Recipe.CookTime < 35 -- In minutes 

GROUP BY RecipeTitle 
ORDER BY Ing DESC -- Orders results by recipes that have the most out of the ingredients the user chose, with less relevant recipes at the bottom 

這裏有我遇到的問題：

• 我想要COUNT(RecipeTitle)來統計結果中每種配方中選擇的成分數量，但它也是計數類別。
• 類別和時間搜索不起作用。它確實顯示包含所選成分的食譜，但也顯示不是Dinner，並且需要35分鐘或更長時間的總時間。

Answer 1

嘗試

SELECT RecipeTitle, COUNT(Ingredient.IngredientId) AS Ing 
FROM Recipe 
JOIN RecipeIngredient ON Recipe.RecipeId = RecipeIngredient.RecipeId 
JOIN RecipeCategory ON Recipe.RecipeId = RecipeCategory.RecipeId 
JOIN Ingredient ON RecipeIngredient.IngredientId = Ingredient.IngredientId 
JOIN Category ON CategoryCategoryId = RecipeCategory.CategoryId 
WHERE Ingredient.IngredientName IN ('olive oil', 'beef', 'parsley') 
AND Category.CategoryName = 'Dinner' 
AND (Recipe.PrepTime + Recipe.CookTime) < 35 
GROUP BY RecipeTitle 
ORDER BY Ing DESC