Database Design Exercises

Transcription

1 Database Design Exercises Miguel Rebollo Introduction to Computer Science

2 Example 1 Given a department code, obtain their name, director and their employees, with their name, category and dedication.

3 Example 2 For a teacher code, determine his name, dedication and category. Furthermore, obtain the set of subjects that he teaches, with its code, name, school and number of hours.

4 Example 3 For a given provider, we want to know its name, address, city and state, and the pieces that they supply, with their colour, category, price and quantity. All items of the same category have the same price.

5 September 2000 Design a relational database that match the following requirements: 1. For a river, to know its name, total length, sea in which it flows and the states it cross, storing their name, extension and the km. that the river covers through each one of them. 2. For each state, to store the name of their bounding states and their capitals, 3. Determine the states without coast, with their extension and their inhabitants.

6 June 2001 Design a database to maintain the menu of a restaurant. For each course, its name, a short description, its difficulty level, a photo and the final price are stored. Each course has a category. Categories are characterised by their name, a short description and the name of the employee in charge of them. Besides the courses, recipes are stored. They are formed by the name of their ingredients, the required amount, units of measurement (grams, litres, ) and the current amount in the storehouse.

7 September 2001 For the next edition of the Spanish Cycling Tour, a newspaper wants to create a database to maintain information about this trial. In the database, information about cyclist, teams and trials must appear. For each cyclist, name, nationality, date of birth, the team to which they belongs to (with he initial and ending contract dates) are stored. For the team, its name, nationality, header s name are stored. For each trial in which the team has participated, the name, year, number of stages, total length (in kilometres) are stored. Besides, we want to know the position of the team at the end of the tour and the name of the winner.

8 June 2002 You has just begun your collection of movies and you want to create a database to store a list of credits. For each film, you need its title, year, nationality and some data about its director: name, date of birth and country. Furthermore, we want to know if it is b/w or coloured, recommended age, abstract and an additional field to put your own remarks. The list of credits must include the casting. For each actor or actress, their names, nationality and name of the film character are stored too.

9 September 2002 You need a database to manage information about the magazines that you buy habitually. For each magazine, its title, the ISSN (code that identifies the publication), number and year are stored. You need also data about the articles, including its title, page of beginning and page of ending. It is assumed that there are no two articles with the same title. Every article can be written by several authors, whose name, address and ascription are stored, Besides, a number that indicates the order of firm have to be stored.

10 June 2003 An ONG wants to prepare a database for all its projects. It has diverse head offices in several countries which take manage and coordinate the projects of that country. On head offices, an identifier, the city and country where it is located, its address, a phone number and the name of the director are stored. Every head office manages a set of projects, with a code, a title, dates of beginning and end, the assigned budget and the name of the person in charge. One project is formed by a set of actions that can affect to several cities We want to know what actions are realised in each city, storing its name, country and nº of inhabitants. We also need an identifier to differentiate them. Also there is wished the investment of the project that corresponds to the city and a small description of the action.

11 September 2003 A company that rents vehicles wants to know in real time the state of his fleet. The company has diverse offices distributed by the whole Spanish territory. Each office is identified by its code and it is characterised by the name of the city, its complete address (street, number and postal code) and phone. Each office has a set of available cars, of which his license is known, the group to which it belongs: A, B, C, D, E, F or G (it depends on the type and size of the vehicle), the brand, the model, the number of doors, the number of seats, the capacity of the trunk and the minimal age required for renting. To control the state of every vehicle, the company has a record of all the rents that the car has suffered, indicating the name of the driver, his DNI, address, a phone contact number and a credit card number. Furthermore, for every rent, its duration (in days), the type of insurance and the final price are stored.

12 June 2004 A zoological park wants to construct a DB to organise the species that it has and the different itineraries to visit the park. The information is structured as follows. For each species, we want to know its common name and its scientific name, as well as a general description and a photo. Every species can live in different natural habitats defined by his name, climate and predominant vegetation. Every species has associated an index of vulnerability inside every habitat, which measures the risk of extinction of the species in the above mentioned habitat. To organize the visits, and according to the habitats that visitors wants to cover, the park offers them a series of trips for the habitats, which are identified by their code and are characterised by their duration, length and maximum number of authorised visitors. A habitat only can be part of one itinerary.

13 September 2004 A health centre need a DB with the case history of all its patients. The health centre is divided into several units, each one having an identifier, a name and the floor in which it is located. The unit has a doctor in charge, characterised by his/her name, code and speciality. When patients arrive, they are admitted in a unit and are registered with their SS number, age and date of admission. While they are still in hospital, all interventions realised by doctors are written down, setting the date, the observed symptom and the prescribed treatment.

14 June 2005 A property development firm wants to create a database to record its housing promotions. A housing promotion is characterised by an internal code, its name, the place in which it is located and a situation map. Every promotion is formed by a set of housings. Each housing has an identifier, area (m 2 ), number of rooms, number of bathrooms, the draft (plane), a photo and its price. Also it is necessary to indicate if it has or not yard, private garden, swimming pool and garage. For the construction, publicity and selling of a promotion, the property firm can hire different companies. For each company, to store its name, type, postal address, phone, fax and it is desirable. Besides, the amount of the contract between the company and the property firm will be stored.

15 September 2005 A health centre need a DB with the case history of all its patients. The health centre is divided into several units, each one having an identifier, a name and the floor in which it is located. The unit has a doctor in charge, characterised by his/her name, code and speciality. When patients arrive, they are admitted in a unit and they are registered with their SS number, age and date of admission. While they are still in hospital, all interventions realised by doctors are written down, setting the date, the observed symptom and the prescribed treatment.

16 June 2006 An auction house wants to maintain a database to register all its transactions. Products sold at auction are grouped in sets. Each set has a catalogue number, start price, highest bid and remaining auction time. Products are characterised by a code, its name, a brief description and a photography. Customers that participates in the auction must bid for a set (bids for individual products are not allowed). When a person bids, the amount, the date and the hour are registered. Customers are identified by an user name. Besides, they have a password, a name and an address. Create the conceptual and the logical scheme of the database that fulfill the requirements expounded.

17 September 2006 A transport company has available a fleet of buses which are distributed in different routes. The company wants to create a database to keep information about these routes. A route is identified by a code. The total length (in km.), the source and the destination of each route is stored. Besides, each bus has a license number, a model, its capacity (number of passengers) and the name of its driver. We assume that a bus can only be covering one route. Routes cover several cities. We ll store the name of the city, the address and the telephone number of the bus station. To keep the stops organised, each bus stop has a order number. This number can be different depending on the route the city belongs to (one city can belong to several routes).

18 June 2007 A company that provides photo storage on the web needs a database to keep all their resources. The photos are characterised by their URL (it's unique) and they have a filename, data type, size, resolution and a field that sets if the photo is public or private. Users add as many tags as they need to each one of their photos to classify them. Each tag keeps the total number of pictures that use the tag. Besides, the system can suggest additional tags, so we need to indicate who has added the tag: the user or the system. To identify the users, a username and password is stored, together with their address. Create the conceptual and the logical schemes of the database that fulfills the requirements expounded.

19 September 2007 You need a DB with links to the web sites you visit to keep an historic more exhaustive than IExplorer Favorites. For each web page, you will store its URL (web address), its name, a short description and a global valuation. Pages are grouped by categories instead of using folders,so each page can belong to several categories. Each categories have a name and keeps a list with its corresponding web sites and the association date. To know the navigation history, each time a web site is visited, an entry will be added to the database with the access date and permanence time. Visits have a unique order number associated to them. Draw the conceptual and the logical schemes of the database that fulfills the requirements expounded.

20 June 2008 A small florist wants to spread its business and have presence in Internet and they need to create a database. Orders are identified by its number and they contains the date, the total amount and a list with the flowers included in the order and their quantity. Flowers are identified by a code, their name and the retail price. Flowers belong to an species. Species have a name, flowering period, planting season, appropriate soil and recommended sun exposure. Create the conceptual and logical model that corresponds with these requirements

21 September 2008 A research center has to get information about pollination processes in a concrete area, so it needs to create a database. Flowers are identified by a code, its name, a description and a photo. Flowers belong to a specie. Each specie has a name, flowering period (blooming), planting season, appropriate soil and recommended sun exposure time. Each flower can be pollinated by different agents (physical, as wind, or animated, as insects o birds). For each agent, its name, type and subtype is stored. Flowers can use different decoys to attract different agents (colours, shapes, scent -smell-,...) Draw the conceptual and the logical schemes of the database that fulfill the requirements expounded.

22 June 2009 Lendmemoney.com is a money lending company that manages lending among people (p2p lending). Lenders that lend they money are registered with an id, their name and their available amount of money for the financial operations. Borrowers are identified by their id and the company registers their name and a risk value depending on their personal situation. When borrowers apply for a loan, a new loan code, the total amount, the refund deadline, the interest rate and its purpose are stored in the database. Lenders choose the amount that they want to invest in each loan. A lender can contribute with different partial amounts to several loans. Create the conceptual and logical model that corresponds with these requirements.

23 September 2009 Social networks as Facebook use profiles to store information about their users. Create a simple database to store these user's profiles. Users have a nick (unique), a password, their real name and a valid account. Users can write comments, which are composed by a text and the publication date. Furthermore, users can appear in photos. A Photo has a filename and an optional description. To tag users in the photos, a frame is used. The coordinates of these frames are stored in the photo too in order to know which users appear in each photo. Create the conceptual and the logical models.

24 June 2010 An airline needs a database to organise the information related with its flights. Flights are characterised by an Id, the departure date and the departure and arrival airports. Each flight as one plane assigned to it. Planes have a registration number (similar to a license plate) that identifies them, the name of the manufacturer, the model, the seating capacity and the flight autonomy (hours). Each flight has a crew assigned to it, formed by a list of members of the staff of the company. Each worker has an Id, a name, a professional category and the position held in each flight. Finally, each flight has a list of passengers in which their name, passport number, seat and class (tourist, first or business) are stored.

25 September 2010 An airline needs a database to register information about its flights. Flights have a unique identifier. Furthermore, each flight has a origin and a destiny airport assigned (considering only direct flights). Airports are identified by three letters (VLC-Valencia, BCN-Barcelona and so on). Besides that, for each airport, the name of the city and the country are stored. Planes are assigned to different flights. A plane is identified by a registration number, the manufacturer, the model and information about its capacity (max. number of passengers) and flight range (measured in hours).the assignment of a plane to one flight is not unique, so to store the date is needed too.