Q2) Write a relational algebra expression that returns food items that are sold at "Aldi" and their price. Answer:
Q2) Write a relational algebra expression that returns food items that are sold at "Aldi" and their price. Answer:
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Q2) Write a relational algebra expression that returns food items that are sold at "Aldi" and their price.
Answer:
Transcribed Image Text:Try to answer all the questions based on what you were learned.
• please write the RA's notations/expression clearly and in sequential order to show all the steps of your
answer.
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
20
40
5
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 ounces
Pasta
50
Meatballs
Tomato Sauce
Onions
Onions
Cheese
Bread
Bread
Ground Beef
stock
shop
Aldi
Aldi
Aldi
Walmart
Treasury Island
price
5
2335
10
15
10
5
1
4
15
20
10
20
Notes:
■ Underlined attribute form the primary key of a relation.
■ 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.
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