鏈接範圍內的SQL項目

Question

我有兩個SQLite表，配方和配料。我需要從配料列表中找到所有包含2到4個項目的食譜，但是我無法將我的頭部圍繞SQL來完成此項工作。

的表是：

CREATE TABLE recipes (
    rowidx INTEGER AUTOINCREMENT, 
    RecipeID TEXT(10) NOT NULL PRIMARY KEY, 
    Name TEXT(255) NOT NULL 
); 

CREATE TABLE Ingredients (
    Recipe TEXT(10) NOT NULL PRIMARY KEY, 
    Ingredient TEXT(255) NOT NULL COLLATE NOCASE, 
    Measurement TEXT(255) NOT NULL 
); 

我開始用簡單的東西，但失去了動力，當我來到「之間n和n成分」的一部分。

SELECT COUNT(*) FROM Recipes 
WHERE RecipeID IN (
    SELECT Recipe FROM Ingredients WHERE Ingredient IN (milk','butter','sugar','flour','egg') 
) 

我確定必須有一個相對簡單的方法來做到這一點，但它不是點擊。

編輯：其實我結束了與下面的答案的修改版本：

SELECT *,ifnull((SELECT COUNT(i.Ingredient) AS IngredientCount FROM Recipes r LEFT JOIN Ingredients i ON r.RecipeID = i.Recipe WHERE i.Ingredient IN ('flour') and r.recipeid = allrecipes.recipeid GROUP BY R.RecipeID),0) AS IngredientCount 
FROM Recipes allrecipes 
WHERE IngredientCount BETWEEN 2 AND 4 

與原來的答案，如果食譜中沒有匹配的成分，並且指定BETWEEN 0 AND 2，它甚至不會出現在列表中進行排序，因此將被排除。

Answer 1

SELECT 
    r.Name, 
    COUNT(i.Ingredient) AS Ingredients 
FROM 
    recipes r 
    LEFT JOIN ingredients i 
     ON i.Recipe = r.RecipeID 
     AND i.Ingredient IN ('milk','butter','sugar','flour','egg') 
GROUP BY r.Name 
HAVING COUNT(i.Ingredient) BETWEEN 2 AND 4 

Answer 2

SELECT r.* FROM Recipes r 
JOIN Ingredients i 
    ON r.RecipeID = i.Recipe 
WHERE i.Ingredient IN ('milk','butter','sugar','flour','egg') 
GROUP BY r.RecipeID 
HAVING COUNT(*) BETWEEN 2 AND 4 

Answer 3

同樣的事情又一個變化：

SELECT R.* 
FROM recipes AS R 
WHERE EXISTS(
    SELECT 0 
    FROM Ingredients AS I 
    WHERE I.Recipe = R.recipeID 
     AND I.Ingredient IN ('milk','butter','sugar','flour','egg') 
    GROUP BY I.Recipe 
    HAVING COUNT(I.Ingredient) BETWEEN 2 AND 4 
)