DATABASE CONCEPTS+MYITLAB
18th Edition
ISBN: 9780134821245
Author: KROENKE
Publisher: PEARSON C
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Question
Chapter 2, Problem 2.1RQ
Program Plan Intro
Relational model:
- In the relational model, data are organized in tables, which consist of rows and columns.
- A data in a row or column of a table are called fields.
- Fields in a
database table are also referred as attributes of a database object.- A group of related fields are called as a record, which is also called as database object or entity.
- A group of records are called a table.
- Keys in a relational database table refer to a key field.
- To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.
- Therefore, key field is used to identify the unique record from a collection of records.
- For example,
- Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.
- The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.
- Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.
Expert Solution & Answer
Explanation of Solution
Importance of relational model:
Relational model is important, due to the following reasons
- It is important because it acts as the universal model to store the data in computers and it can be easily available.
- Specific values can be easily accessed through a database.
- It can be used for the designing and implementation of commercial database.
- Its data storage capacity can be extended and it won’t depend on physical organization.
- It includes the Structured Query Language (SQL).
- It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.
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I need help to resolve the case, thank you
In 32-bit MSAM, You were given the following negative array. write a program that converts each array element to its positive representation. Then add all these array elements and assign them to the dl register. .data myarr sbyte -5, -6, -7, -4.code ; Write the rest of the program and paste the fully working code in the space below.
the dl register should have the value 22 after summing up all elements in the array.
Microprocessor 8085 Lab Experiment
Experiment No. 3 Logical Instructions
Write programs with effects
1. B=(2Dh XOR D/2) - (E AND 2Eh+1) when E=53, D=1Dh
2. HL= (BC+HL) XOR DE (use register pair when necessary), when BC=247,
HL 516, DE 12Ach
3. Reset bits 1,4,6 of A and set bits 3,5 when A=03BH
Write all as table (address line.hexacode,opcede,operant.comment with flags)
Chapter 2 Solutions
DATABASE CONCEPTS+MYITLAB
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Define the terms candidate key and primary key....Ch. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Apply the normalization process to the Veterinary...
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