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Q1) person(person name, street, city) // records about all people works(person name, company name, annual salary) // records about employed people company(company name, founded) // companies and years when they were founded company location(company name, city) // companies and cities where they have oces managed by(person name, manager name) // employed people and their managers
Give an expression in relational algebra for each of the following queries:
(a) Find the maximum salary of all employees who are not managers.
(b) Give all the managers in the database a 10 percent salary raise. Give all the other employees a 5 percent salary raise.
You have just received a new computer at work. it runs fast and works great. thinking about the future and the day something might break explain why it is important to record this information.
Its a lead a project that will implement a new learning management system for your university. You have two key tasks: Task 1: Investigate learning management software packages that are available through application service providers.
Implement a database of courses and students for a school.
Write the following procedures: woman_wants_to_enter, man_wants_to_enter, woman_leaves, man_leaves, using counters and sychronisation techniques to ensure that the correct behaviour will occur.
Create a state transition diagram that describes typical student states and how they change based on specific actions and events.
To lock any other vertex, the transaction must have visited all the parents of that vertex and must be having a lock on one of the parents of the vertex. Show that the protocol ensures serializability and deadlock freedom.
Need a system that networks its 3 campuses in the US and one campus in Singapore. Transaction data for all campuses should be available to all locations. In addition, students should be able to use the Internet to view classes, enroll, register, and ..
Difference between obsolescent and redundant stocks
Prepare the relational schema for database
Design a work breakdown structure for the task below: Designing the database, Working on the website content
How can you make your database more hacker proof? How do you ensure the security of an organizations distributed database?
Describe how to create a query in Access Query Wizard equilvant to the query: SELECT first, last, department, hours FROM payroll WHERE hours>.
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