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Consider the following relational schema for a library:
member(memb_no,name,dob) books(isbn,title,authors,publisher) borrowed(memb_no,isbn,date)
Write eh following queries in relational algebra.
a. Find the names of members who have borrowed any book published by "McGraw-Hill". b. Find the names of members who have borrowed all book published by "McGraw-Hill". c. Find the name and membership number of members who have borrowed more than five books published by "McGraw-Hill". d. Find the name and membership number of members who have borrowed more than five different books of that publisher. e. Find the average number of books borrowed per member. Take into account that if a member does not borrow any books, then that member does not appear in the borrowed relation at all.
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?
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.
MGMT321 Group Project : You were hired as an analyst to develop a new information system to automate the payroll transactions in a mid-size organization. The proposed system will contain employees’ data and interface with the organization’s General ..
Complete (i.e., reverse engineering) ER diagram below such that 4 relation schemas above are exactly result of a translation from the ERD to the relational model.
We want to construct a database for a world-wide package delivery company. Define a set of relational schemas and identify primary and foreign keys. Try not to include redundant schemas.
Difference between obsolescent and redundant stocks
Show all the data in each of the four tables. Do not show foreign key columns. Write names and e-mail addresses for all customers who have had a stove repair that cost more than $50.
Assume that relation Employee has no tuples in it initially. You are to show the simplest example you can think of where using trigger T1 will produce a different final database state than using trigger T2.
Write an SQL query to get the author of the book "The Alchemist"
Describing the purpose of database an its functionality, plus a detailed E-R diagram.
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.
Draw an ER diagram for your database scenario. Design a set of 3NF tables for your database scenario.
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