<p>Kuwait University College of Computing Sciences & Engineering</p><p>Information Science Department ISC 321: Database Systems Summer 2016 Homework #2 due: 12/6/2016</p><p>1. Talabat.com is a Kuwaiti online food delivery web site and mobile app. It has been recently sold to a German e-commerce company for 50 million KD. You are required to design the ER diagram of the DB system of Talabat.com based on the following information:</p><p> The DB should contain information about the users who have accounts with the web site. Each user has a name, a unique user id, a unique e-mail, a password, a date of birth and an address that consist of the block, street and house numbers.  Each user live in one area that has a unique area name and a governorate that it belongs to.  Information about the orders made are stored in the DB system. Each order has a unique order number and a date when the order was made.  Each order is made to a restaurant. Each restaurant has a unique restaurant id, a name, a type of food and an address that consist of an area, a block number, a street number and a house number.  Each restaurant has many menu items. Each menu item has a unique item id, an item name and a description.  Each restaurant delivers to certain areas in the country. Each area is delivered to by many restaurants.  Finally, each order contains a number of menu items. The quantity of each item should be stored for each order.</p><p>Create the ER diagram for this DB system. </p><p>2. Projects Inc., is an engineering firm. A database is required to keep track of all employees, assigned projects and departments in which they work.</p><p>- Every employee has a unique number assigned by the firm, a name, and date of birth. If an employee is married to another employee of the firm, the data of the marriage and who is married to whom must be stored; however, no record of marriage is required if an employee’s spouse is not also an employee. Each employee has a job title. Each employee does only one type of job at a time, and we only need to retain information about an employee’s current job. - There are many different departments in the firm, each with a unique name. An employee can report to only one department. Each department has a phone number. - To procure various types of equipment, each department deals with many vendors. A vendor typically supplies equipment to many departments. We Kuwait University College of Computing Sciences & Engineering</p><p> need to store the name and address of each vendor and the date of the last meeting between a department and a vendor. - Many employees can work on a project. An employee can work on many projects, but can only be assigned to at most one project in a given city. For each city, we are interested in its state and population. - Projects are distinguished by project numbers and we must store the estimated cost of each project.</p><p>Create the ER diagram for the database. </p><p>3. Suppose you are given the following requirements for a simple database for the National Hockey League (NHL): - The NHL has many teams, - Each team has a name, a city, a coach, a captain, and a set of players, - Each player belongs to only one team, - Each player has a name, a position (such as left wing or goalie), a skill level, and a set of injury records, - Ateam captain is also a player, - A game is played between two teams (referred to as host_team and guest_team) and has a date (such as May 11th, 1999) and a score (such as 4 to 2). Construct a clean and concise ER diagram for the NHL database.</p>