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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.
Describing the purpose of database an its functionality, plus a detailed E-R diagram.
Did the corresponding lines for invoices 1001 and 1008 in table LINE get deleted automatically? Can you explain why?
Write a SELECT statement that returns two columns: VendorName and PaymentSum, where PaymentSum is the sum of the PaymentTotal column.
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 queries for the books database that perform each of the following tasks: Select all authors from the Authors table with the columns in the order lastName, firstName and authorID.
The DBA denormalized some of the data in the Premiere Products database to improve performance. Which field or fields cause the table to no longer be in third normal form? In which normal form is the denormalized table?
All primary keys are underlined. All foreign keys have same name as primary key that they are referencing. Determine the names of all Tracks which are more than 10 minutes (600,000 ms) long.
Using Internet as the research tool for extra information not presented in text, describe why application roles are important part of the security model for databases.
Create a database from scratch that contains, at a minimum, the elements listed below
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.
Produce a scatterplot of Rent vs. Size (square meters of the apartment) for the rental data in rent.
Draw an ER diagram for your database scenario. Design a set of 3NF tables for your database scenario.
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