Consider the following schema (keys are underlined): Product(pid , name, type, manufacturer, price), Buys(cid, pid ), Customer(cid , cname, age, gender) Write the following query in relational algebra and SQL (For relational algebra use pi for n, sigma for o, join for M, div for +) . "Find the names of all customers who have purchased all products manufactured by Sears." . "Find the names of all customers who have not purchased the most expensive product." • "Find the names and cids of all customers who have purchased the second most expensive product." You can assume that no two products have the same price.

Consider the following schema (keys are underlined): Product(pid , name, type, manufacturer, price), Buys(cid, pid ), Customer(cid , cname, age, gender) Write the following query in relational algebra and SQL (For relational algebra use pi for n, sigma for o, join for M, div for +) . "Find the names of all customers who have purchased all products manufactured by Sears." . "Find the names of all customers who have not purchased the most expensive product." • "Find the names and cids of all customers who have purchased the second most expensive product." You can assume that no two products have the same price.

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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Concept explainers

SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.

Question

Consider the following schema (keys are underlined):
Product(pid
Buys(cid, pid ),
Customer(cid
name, type, manufacturer, price),
cname, age, gender)
Write the following query in relational algebra and SQL
(For relational algebra use pi for z,
sigma for o, join for M, div for )
"Find the names of all customers who have purchased all products manufactured by Sears."
"Find the names of all customers who have not purchased the most expensive product."
"Find the names and cids of all customers who have purchased the second most expensive product." You can assume that no two products have the
same price.

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