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The database schema is as follows:
AIRPORT(city, country, runways); (the last attribute is the number of runways at an airport)FLIGHT (flightID, day, depart_city, arrive_city, depart_time, arrive_time, plane_type)PLANE(plane_type, capacity)
Write following queries in SQL and relational algebra:
1) Find the airports with a direct flight to Toronto2) Find airports with late flights to Toronto on a big plane. "Late" means departing after 9:00pm; "big" means with capacity 150 passengers or more3) Find cities from which one can fly to Toronto with one change of planes, and using the same type of the aircraft for both legs of the trip.Write following queries in SQL and relational algebra.1) Find flight numbers of flights that use a small (capacity less than 50) plane2) Find all airports with at least 3 runways that have 2 or more flights to Paris a day, or with capacity at least 250.Assumption: (flightId, day) pairs are unique (i.e., there are no two flights with the same flightId on the same day).
Create a data warehouse for electronics store chain. The chain has 20 stores in 5 cities. Each store has different sections including computers, DVDs, TVs, audio, home appliances etc.
Write the application for university admissions office. Prompt user for a student's High School Grade Point and an admission test score.
Illustrate relational algebra expressions for names of all salespeople, names of all salespeople having ORDER row and names of salespeople not having ORDER row.
In talking about database security, some aspects to regard as are Data Integrity, Confidentiality, and Malicious Activity. Illustrate how does database security relate to data integrity?
Over 70% of web applications use database to store persistent data. Write some of the problems and issues associated with internet databases?
Assume that 30% of science students are majoring in biology. Would you consider to be novel with respect to rule? Describe. Calculate confidence and support of rule.
Suggest how to implement direct-address table in which keys of stored elements don't require to be distinct and elements can have satellite data.
What are triggers used for, and why are they important in database systems? Provide an example of a situation where a trigger would be appropriate.
Why are these so significant yet so frequently ignored by developers? Write the long term problems when these constraints are not implemented? "
Start with LAN on RTA and proceed clockwise. Determine the number that how many total valid host addresses will be wasted on WAN links?
Explain the content of this document in natural language;Design the graph representation of document;
Your task is to develop a database to support this activity.Here is what you need to be able to provide Custom Auto Body in order to land your first consulting contract:
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