PROBLEM 3 ONLY

Relational algebra & it's implementation (SQL: DDL & DML) Consider two relation instances below, with the following schemas Country (country name, continent); City (city name, country name, is_capital, population) Problem 1, Use SQL(DDL) to create the above two tables, and populate the data as shown in the below two instances Problem 2. In each question (a)-(d) below, write a Relational Algebra expression and show its result when the expression is executed with the given instances. Problem 3. For each question (a)-(d) below, write a SQL(DML) statement, and implement it in the Oracle, then copy&paste your screenshot of the returned result from the Oracle system. Country country_name US Canada England German France Mali continent North America North America Europe Europe Europe Africa Cit country_name is_capital US US US Canada Canada Germany German Germany France France Mali Mali Mali population city name New York, NY Washington, DC Philadelphia, PA Ottawa Toronto Berlin Hambur Bonn Paris Lyon Bamako Timbuktu no 600000 1500000 800000 2500000 no 300000 2000000 700000 2000000 50000 100000 no yes no (a) List the names of all European cities with population of more than 500,000 (b) List the names of all countries whose cities do not exist in the City table (c) List names and continents of countries that are either in Europe or whose capitals have a population of over 1 million. (d) List all pairs of cities such that one of them is a capital of some country, and the other is a non-capital city in that same country. For each city in the pair, list its name