Q7:7.1 List down three or more current principles of relationaldatabase. Write your answer in 200-250 words.7.2 Explain following types of database model in brief. Write youranswer in 200-250 words.a) Hierarchical database modelb) Object-Oriented Database

(7.1) Current Principles of Relational Databases (200-250 words) Relational databases are built on…

Answered: Q7: 7.1 List down three or more current…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Exercise 6.3.1: Write the following queries, based on the database schema Product (maker, model, type) PC(model, speed, ram, hd, price) Laptop (model, speed, ram, hd, screen, price) Printer (model, color, type, price) of Exercise 2.4.1. You should use at least one subquery in each of your answers and write each query in two significantly different ways (e.g., using different sets of the operators EXISTS, IN, ALL, and ANY). a) Find the makers of PC's with a speed of at least 3.0. b) Find the printers with the highest price. !c) Find the laptops whose speed is slower than that of any PC. ! d) Find the model number of the item (PC, laptop, or printer) with the highest price. ! e) Find the maker of the color printer with the lowest price. !! f) Find the maker(s) of the PC(s) with the fastest processor among all those PC's that have the smallest amount of RAM.
1.State TRUE or FALSE. A logical representation of the database structure is obtained by carefully interpreting the interview results of a business. a.This is trueb.This is false 2.A generic name for an object, such as a person, a computer, or a location that you want to keep in a database is called ….. a.A keyb.An entityc.A constraintd.An entry
"6.1,6.2,and 6.1 are answered" **As per Bartleby guidelines, solving the first 3 sub-parts as the question contains many parts and the required parts to be answered is not mentioned. It will involve the below steps: Converting ERD to relational schema The database will need to create below tables: **Primary key is bold and underlined, Foreign key is italic Patient(Pat_ID, Pat_Name, Pat_Age, Pat_Gender) Doctor(Doc_ID, DOc_Name, Doc_EmployDate, Prc_ID) Consultation(Doc_ID, Pat_ID, Con_Date) Practice(Prc_ID, Prc_Name, Prc_YearEstablished, Prc_Province) 6.1 Create tables in SQL Below is the script to create the tables with attributes and foreign key constraints: //Script will create the database named TrueHealth and then populate the tables: create database trueHealth;use truehealth; CREATE TABLE Patient(Pat_ID CHAR(4) primary key, Pat_Name varchar(50), Pat_Age int, Pat_Gender varchar(10)); CREATE TABLE Practice(Prc_ID int primary key, Prc_Name varchar(50),…
Subject:database administration and management question: select a database like customer tb,employee tb and customer tb make a set of predicate generate minterm predicate and fragments and make a correctness rule of fragmentation
1. Connect mySQL database by using Python. 2. Create database and tables as given below by using Python. (a) BANK database (b) CUSTOMER: customer_id integer, name varchar, lastname varchar, registration_date date, score integer (c) BRANCH: branch_id integer, branch name varchar, cash_hold float, foundation date date, liability float (d) LOAN: loan_id integer, customer_id integer, branch_id integer, amount float Choose primary and foreign keys depending on the base design. 3. Create arrays of at least 5 different records. Use these arrays to populate each table in the database.
143. The collection of all the concepts that must be used to describe database structure is called a. structural model b. server model c. data model d. client model
1- Name the 4 UDTs (user defined types) in object relational database with examples.
Consider a database with the following tables: Using sql query or steps V Patient(PatientID. PatientName, NumberOfVisits) / Doctor(DoctorID. DoctorName) Appointment(AppID. DoctoriD, PatientID, Date, time) 1.Create a Schema called DR and Add Assign those tables to it.
Course: Database Systems: Design and Application
Consider a database with the following three tables: RACES[RaceName, Year, Organizer, Country, Federation, Type, Distance] RaceName and Year form the primary key. Type is from { Run, Triathlon, Bike, MountainBike }. Distance is given in meters. RESULTS[RaceName, Year, Place, AthleteName] (RaceName, Year, Place) form the primary key. (RaceName, Year) form a foreign key referencing RACES. RECORDS[RaceName, Year, Record, Time] (RaceName, Year, Record) form the primary key. The foreign key is the same as for RESULTS. The values of Record could be, e.g., World Record, National Record, Fastest Time. Time is in seconds. Write queries in SQL that produce the answers to the following questions: (a) Find the names of all athletes who exclusively participate in runs that are longer than 40 kilometers. (b) Find organizers who organized a mountain-bike and a bike race, where the mountain-bike race was longer than the bike race. (c) Find the names of all athletes who achieved a world record in…
For each item below, specify whether the statement is true (T) or false (F). A Database Schema keeps the data in a database. Each Data Model is based on a Database Management System (DBMS). Oracle and MYSQL are two of the most popular Data Models. JDBC is a Data Manipulation Language (DML) developed for Java. Database Users may desire to perform conflicting operations at the same time. For example, in an Airline Reservation System, two on-line users may see the last empty seat while trying to reserve a seat on a flight. Security features of a DBMS prevents them from reserving the same seat, therefore avoiding inconsistent database states. In the Entity-Relationship Model (E-R), any distinguishable abstract or concrete thing is called an entity set/type. In the Entity-Relationship Model (E-R), an Attribute maps an entity to another entity (or a set of entities). A Relationship, on the other hand, maps an entity to a primitive value. "many to many" relationships in E-R map each instance…
Doctors have id. name. date of birth. and specialty. Patients have id. name, and date of birth. and address. Medicines have name. patent number, and milligrams We want to build A database that keeps track of the medicines prescribed by a doctor to patients The prescription process happens in a hospital. (a) Draw a complete Entity-Relationship diagram for the description above. You must include all the details, such as keys, weak entities (if any). cardinality constraints., etc Your diagram must use n-ary relationships You must use arrow notation Your diagram must avoid redundancy.

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Q7: 7.1 List down three or more current principles of relational database. Write your answer in 200-250 words. 7.2 Explain following types of database model in brief. Write your answer in 200-250 words. a) Hierarchical database model b) Object-Oriented Database