Question: Consider the following database schema and example instance: ingredient recipe name Pasta and Meatballs Cheese Soup Burger item Pasta Meatballs Tomato Sauce Onions Cheese

Consider the following database schema and example instance: ingredient recipe name Pasta and Meatballs Cheese Soup Burger item Pasta Meatballs Tomato Sauce Onions Cheese Bread Ground Beef inventor Le cook The french Cowboys foodItem type Wheat product Meat Sauce Vegetables Diary Wheat product Meat kitchen Italian French American calories RESI884 20 40 1 30 25 45 recipe Pasta and Meatballs Pasta and Meatballs Pasta and Meatballs Pasta and Meatballs Cheese Soup Cheese Soup Cheese Soup Burger Burger foodItem Pasta Meatballs Tomato Sauce Tomato Sauce. Cheese foodItem Pasta Meatballs Tomato Sauce Onions Onions Cheese Bread Bread Ground Beef stock shop Aldi Aldi Aldi Walmart price 5 10 emm! 3 3 ounces 50 Treasury Island 15 10 5 1 4 15 20 10 20 Notes: Underlined attribute form the primary key of a relation. I The attribute recipe of relation ingredient is a foreign key to relation recipe. The attribute foodltem of relation ingredient is a foreign key to relation foodItem. The attribute foodItem of relation stock is a foreign key to relation foodItem. Q3) Write a relational algebra expression that returns food items (item) that are of type "Wheat product" or of type "Meat" and have at least 20 calories per ounce (attribute calories). Answer:

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