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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.
Design an er schema for keeping track of information about votes taken in the U.S. House of Representatives during the current two year congressional session.
VSS has an existing software package that controls its high bay systems and wants to rewrite it. The existing system is written in C and uses C-ISAM files to store data.
Write SQL statements that do the following: Calculate the average salary for all employees. Calculate the maximum salaries for exempt and non-exempt employees.
Create a function that returns the day of the week for a specified date. Create a trigger that displays the message "Emp table updated" when an update to the employee table increases the employee's basic salary.
You are interested in analyzing some hard-to-obtain data from two separate databases. Each database contains n numerical values.
What is the order P of the B+-tree if B+-tree access structure on the key is constructed? What is the number of leaf-level blocks needed if blocks are approximately 69% full (round up for convenience)?
You have probably seen that already when you tried to create an E-R diagram. Visio uses notation and graphical shapes that are not the same as those in your text. If you look at some of the links to schemas, you will see a similar sort of thing.
Draw Active Directory hierarchy in terms of forests, trees, domains, organizational units, and sites which are most suitable for this company and their security concerns.
Implement a database of courses and students for a school.
CAR (Serial-No, ModConsider the given relations for database which keeps track of auto sales in car dealership.
Monitor Renal Outcomes in patients post cardiac bypass surgery?
Illustrate relational algebra expressions for names of all salespeople, names of all salespeople having ORDER row and names of salespeople not having ORDER row.
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