Essentials of MIS (12th Edition)
Essentials of MIS (12th Edition)
12th Edition
ISBN: 9780134238241
Author: Kenneth C. Laudon, Jane P. Laudon
Publisher: PEARSON
Question
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Chapter 6, Problem 5DQ
Program Plan Intro

Database:

  • A group of structured data that can be used to serve many applications by centralizing the data and regulating redundant data is called as database.
  • In the database, data is appeared to users as being stored in only one location.

Database Management Software:

A collection of programs is called as database management system, which provides some features such as:

  • Management of databases
  • Controlling access to data
  • Query language to retrieve information
  • The data in the DBMS (Data Base Management system) is made up of three components such as:
    • Physical database
    • Database engine
    • Database schema

DBMS acts as an interface between application programs and the physical data files.

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Q4: Consider the following MAILORDER relational schema describing the data for a mail order company. (Choose five only). (10 Marks) PARTS(Pno, Pname, Qoh, Price, Olevel) CUSTOMERS(Cno, Cname, Street, Zip, Phone) EMPLOYEES(Eno, Ename, Zip, Hdate) ZIP CODES(Zip, City) ORDERS(Ono, Cno, Eno, Received, Shipped) ODETAILS(Ono, Pno, Qty) Qoh stands for quantity on hand: the other attribute names are self-explanatory. Specify and execute the following queries using the RA interpreter on the MAILORDER database schema. a. Retrieve the names of parts that cost less than $20.00. b. Retrieve the names and cities of employees who have taken orders for parts costing more than $50.00. c. Retrieve the pairs of customer number values of customers who live in the same ZIP Code. d. Retrieve the names of customers who have ordered parts from employees living in Wichita. e. Retrieve the names of customers who have ordered parts costing less than$20.00. f. Retrieve the names of customers who have not placed…
ut da Q4: Consider the LIBRARY relational database schema shown in Figure below a. Edit Author_name to new variable name where previous surname was 'Al - Wazny'. Update book_Authors set Author_name = 'alsaadi' where Author_name = 'Al - Wazny' b. Change data type of Phone to string instead of numbers. عرفنه شنو الحل BOOK Book id Title Publisher_name BOOK AUTHORS Book id Author_name PUBLISHER Name Address Phone e u al b are rage c. Add two Publishers Company existed in UK. insert into publisher(name, address, phone) value('ali','uk',78547889), ('karrar', 'uk', 78547889) d. Remove all books author when author name contains second character 'D' and ending by character 'i'. es inf rmar nce 1 tic عرفته شنو الحل e. Add one book as variables data? عرفته شنو الحل
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