Keys in a Relational Database

Topics

Exceptional Handling in Python
- Introduction of Exception Handling in Python
- Syntax Errors
- Exceptions
- Built-in Exceptions
- Raising Exceptions
- Handling Exceptions
- Finally Clause
- Types of Function
- Creating User Defined Function
- Arguments and Parameters
- Default Parameters
- Positional Parameters
- Function Returning Values
- Flow of Execution
- Scope of a Variable
Object Oriented Programming with Python
- Concept of Object Oriented Programming with Python
- Data Hiding in Python
- Data Encapsulation in Python
- Class and Object in Python
- Polymorphism in Python
- Inheritance in Python
- Advantages of Object Oriented Programming Over Earlier Programming Methodologies in Python
- Defining Classes (Attributes, Methods)
- Creating Instance Objects
- Accessing Attributes and Methods
- Using Built in Class Attributes (Dict, Doc, Name, Module, Bases)
- Constructor(_Init()_ _, _ _Del()_ _ and _ _ Str()_ _) Methods in a Class
- Private Attributes (Limited Support)
- Importance of "Self" (Acts as a Pointer to Current Calling Object) Operator Overloading with Methods
- Concept of Base Class and Derived Class
- Single, Multilevel and Multiple Inheritance
- Overriding Methods
- Using Super() in Derived Class to Invoke _ _Init()_ _ Or Overridden Methods of Parent Class
Unit 1: Computational Thinking and Programming
File Handling in Python
- Introduction to Files
- Types of Files in Python
- Types of Path in Python
- Opening and Closing a Text Files
- Text File Open Modes
- Writing to a Text File
- Reading from a Text File
- Setting Offsets in a File
- Creating and Traversing a Text File (Data Manipulation)
- The Pickle Module
- Opening and Closing a Binary File in Python
- Binary File Open Modes
- Writing to a Binary File
- Reading from a Binary File
- Appending in a Binary Files
- Searching a Binary File
- Update Operations in a Binary File
- Import CSV Module
- Opening and Closing a CSV File in Python
- Read and Write a CSV File Using Python
Unit 2: Database Management
Advance Programming with Python
- Linear List Manipulation
- Sequential Allocation
- Traversal
- Insertion of an Element in a Sorted List
- Deletion of an Element from the List
- Searching (Linear, Binary)
- Sorting (Insertion, Selection, Bubble)
- Introduction to Stack in Python (LIFO Operations)
- Operations on Stack (PUSH and POP) and Its Implementation in Python
- Converting Expressions from INFIX to POSTFIX Notation and Evaluation of Postfix Expression in Python
- Queues (List Implementation)
- Introduction to Queue in Python (FIFO)
- Operations on Queue (INSERT and DELETE) and Its Implementation in Python
- Need for Data File in Python
- Types of Files in Python
- Opening and Closing a Text Files
- Access Modes (Output, Input, Default)
- File Object
- Reading and Writing a File - Read(), Readline(), Readlines(), Write(), Writelines
- File Positions (Seek(), Tell())
- Renaming and Deleting a File.,Flush()
- Searching for Particular Data from a File
- Insertion and Deletion of Data from an Already Existing File
- Modification of Data in File
- Error and Exceptions - NameError, IndexError, TypeError, IO Error, ImportError, ValueError, EOFError
- Generator Function Using Yield
Unit 3: Computer Networks
Stack
- Stack
- Operations on Stack
- Implementation of Stack in Python
- Notations for Arithmetic Expressions
- Conversion from Infix to Postfix Notation
- Evaluation of Postfix Expression
Python - Databases and SQL
- Introduction to Database Concepts
- Relational Data Model
- Relational Algebra
- Structured Query Language Advantages of Using SQL
- Data Definition Language and Data Manipulation Language
- Data Types - NUMBER/DECIMAL, CHARACTER/VARCHAR/VARCHAR2, DATE
- SQL COMMANDS - CREATE TABLE, DROP TABLE, ALTER TABLE, UPDATE ….SET…., INSERT, DELETE; SELECT, DISTINCT, FROM, WHERE, IN, BETWEEN, GROUP BY, HAVING, ORDER BY
- Functions in SQL
- Obtaining Results (Select Query) from 2 Tables Using equi-join
- Cartesian Product and Union
Python - Boolean Algebra
- Binary-valued Quantities
- Boolean Variable
- Boolean Constant and Boolean Operators - AND, OR, NOT
- Truth Tables (Boolean Algebra)
- Closure Property
- Commutative Law
- Associative Law
- Identity Law
- Inverse Law
- Principle of Duality
- Idempotent Law
- Distributive Law
- Absorption Law
- Involution Law
- DeMorgan’S Law/Theorem and Their Applications
- Obtaining Sum of Product (SOP) and Product of Sum (POS) Form the Truth Table
- Reducing Boolean Expression (SOP and POS) to Its Minimal Form
- Use of Karnaugh Map for Minimization of Boolean Expressions (Up to 4 Variables)
- Application of Boolean Logic - Digital Electronic Circuit Design Using Basic Logic Gates (NOT, AND, OR, NAND, NOR)
- Use of Boolean Operators (NOT, AND, OR) in SQL SELECT Statements
- Use of Boolean Operators (AND, OR) in Search Engine Queries
Queue
- Introduction to Queue in Python (FIFO)
- Operations on Queue
- Implementation of Queue Using Python
- Introduction to Deque
- Implementation of Deque Using Python
Project
Python - Communication Technologies
- Evolution of Networking
- ARPANET
- Internet
- Interspace Different Ways of Sending Data Across the Network with Reference to Switching Techniques (Circuit and Packet Switching)
- Data Communication Terminologies
- Concept of Channel
- Bandwidth (Hz, KHz, MHz) and Data Transfer Rate (Bps, Kbps, Mbps, Gbps, Tbps)
- Twisted Pair Cable
- Coaxial Cable
- Optical Fiber
- Infrared
- Radio Link
- Microwave Link
- Satellite Link
- Network Devices
- Networking Topologies
- Network Protocol - TCP/IP
- Network Protocol - File Transfer Protocol (FTP)
- Network Protocol - PPP
- Network Protocol - SMTP
- Network Protocol - POP3 Remote Login (Talent)
- Internet Wireless/Mobile Communication Protocol - GSM, CDMA, GPRS, and WLL
- Mobile Telecommunication Technologies
- Mobile Processors
- Electronic Mail Protocols Such as SMTP, POP3
- Protocols for Chat and Video Conferencing VOIP
- Wireless Technologies Such as Wi-Fi and WiMax
- Network Threats and Its Prevention
- Cookies
- Protection Using Firewall
- https
- India IT Act
- Cyber Law
- Cyber Crimes
- IPR Issues
- Hackers and Crackers (Hacking)
- World Wide Web (WWW)
- Hyper Text Markup Language (HTML)
- Extensible Markup Language (XML)
- Hyper Text Transfer Protocol (HTTP)
- Domain Name System
- URL
- Website
- Web Browser
- Web Servers
- Web Hosting
- Web Scripting - Client Side (VB Script, Java Script, PHP)
- Server Side (ASP, JSP, PHP)
- Web 2.0 (For Social Networking)
- E-commerce Payment Transactions Using Online Banking
- Mobile Banking and Payment Apps and Services
Sorting
- Introduction of Sorting
- Bubble Sort
- Selection Sort
- Insertion Sort
- Time Complexity of Algorithms
Searching
- Introduction of Searching
- Linear Search
- Binary Search
- Search by Hashing
Understanding Data
- Introduction to Data
- Importance of Data
- Types of Data
- Data Collection
- Data Storage
- Data Processing
- Statistical Techniques for Data Processing
- Measures of Central Tendency for Data Processing
- Measures of Variability
Database Concepts
- Introduction to Database Concepts
- File System
- Limitations of a File System
- Database Management System (DBMS)
- Applications of DBMS
- File System to Database Management System (DBMS)
- Key Concepts in Database Management System (DBMS)
- Relational Data Model
- Terminologies in Relational Data Model
- Properties of a Relational Data Model
- Keys in a Relational Database
Structured Query language (SQL)
- Introduction of Structured Query Language (SQL)
- Structured Query Language (SQL)
- Data Types and Constraints in MySQL
- SQL for Data Definition
- SQL for Data Manipulation
- SQL for Data Query
- Data Updation and Deletion
- Functions in SQL
- GROUP BY Clause in SQL
- Operations on Relations
- Using Two Relations in Query
- Connecting SQL with Python
- Performing Insert, Update, Delete Queries Using Cursor
- Display Data by Using Fetchone(), Fetchall(), Rowcount
- Creating Database Connectivity Applications
Computer Networks
- Introduction to Computer Networks
- Evolution of Networking
- Types of Computer Networks
- Network Devices
- Networking Topologies
- Types of Networking Topologies
- Identifying Nodes in a Networked Communication
- Internet, Web and the Internet of Things
- Domain Name System
- Hyper Text Markup Language (HTML)
- Extensible Markup Language (XML)
- URL
- Website
- Web Browser
- Web Servers
- Web Hosting
Data Communication
- Concept of Data Communication
- Components of Data Communication
- Measuring Capacity of Communication Media
- Types of Data Communication
- Switching Techniques
- Transmission Media
- Transmission Media
- Mobile Telecommunication Technologies
- Protocol
Security Aspects
- Network Threats and Its Prevention
- Malware
- Antivirus
- Spam
- HTTP vs HTTPS
- Protection Using Firewall
- Cookies
- Hackers and Crackers (Hacking)
- Network Security Threats
Project Based Learning
- Introduction of Project Based Learning
- Approaches for Solving Projects
- Teamwork
- Components of Teamwork
- Project Description

description

Candidate Key
Primary Key
Alternate Key
Composite Primary Key
Foreign Key

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Related QuestionsVIEW ALL [13]

Explain the use of ‘Foreign Key’ in a Relational Database Management System. Give example to support your answer.

A school has a rule that each student must participate in a sports activity. So each one should give only one preference for sports activity. Suppose there are five students in a class, each having a unique roll number. The class representative has prepared a list of sports preferences as shown below. Answer the following:

Sports Preferences
Roll_no	Preference
9	Cricket
13	Football
17	Badminton
17	Football
21	Hockey
24	NULL
NULL	Kabaddi

Roll no 24 may not be interested in sports. Can a NULL value be assigned to that student’s preference field?
Roll no 17 has given two preference sports. Which property of relational DBMC is violated here? Can we use any constraint or key in the relational DBMS to check against such violations, if any?
Kabaddi was not chosen by any student. Is it possible to have this tuple in the Sports Preferences relation?

Why foreign keys are allowed to have NULL values? Explain with an example.

Differentiate between Primary key and foreign key.

The school canteen wants to maintain records of items available in the school canteen and generate bills when students purchase any item from the canteen. The school wants to create a canteen database to keep track of items in the canteen and the items purchased by students. Design a database by answering the following question:

In order to generate the bill, we should know the quantity of an item purchased. Should this information be in a new relation or a part of the previous relation? If a new relationship is required, decide the appropriate name and data type for attributes. Also, identify the appropriate primary key and foreign key so that the following two restrictions are satisfied:

The same bill cannot be generated for different orders.
Bill can be generated only for available items in the canteen.

An organisation wants to create a database EMPDEPENDENT to maintain the following details about its employees and their dependent.

EMPLOYEE(AadharNumber, Name, Address, Department, EmployeeID)
DEPENDENT(EmployeeID, DependentName, Relationship)

The company wants to retrieve details of the dependent of a particular employee. Name the tables and the key which are required to retrieve this detail.

Student Project Database
Table: STUDENT
Roll No	Name	Class	Section	Registration_ID
11	Mohan	XI	1	IP-101-15
12	Sohan	XI	2	IP-104-15
21	John	XII	1	CS-103-14
22	Meena	XII	2	CS-101-14
23	Juhi	XII	2	CS-101-10
Table: PROJECT
ProjectNo	PName	SubmissionDate
101	Airline Database	12/01/2018
102	Library Database	12/01/2018
103	Employee Database	15/01/2018
104	Student Database	12/01/2018
105	Inventory Database	15/01/2018
106	Railway Database	15/01/2018
PROJECT ASSIGNED
Registration_ID	ProjectNo
IP-101-15	101
IP-104-15	103
CS-103-14	102
CS-101-14	105
CS-101-10	104

For the above-given database STUDENT-PROJECT, answer the following:

Name the primary key of each table.
Find foreign key(s) in table PROJECT-ASSIGNED.
Is there any alternate key in table STUDENT? Give justification for your answer.
Can a user assign duplicate value to the field RollNo of STUDENT table? Justify.

In a multiplex, movies are screened in different auditoriums. One movie can be shown in more than one auditorium. In order to maintain the record of movies, the multiplex maintains a relational database consisting of two relations viz. MOVIE and AUDI respectively as shown below:

Movie(Movie_ID, MovieName, ReleaseDate) Audi(AudiNo, Movie_ID, Seats, ScreenType, TicketPrice)

Is it correct to assign Movie_ID as the primary key in the MOVIE relation? If no, then suggest an appropriate primary key.

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Keys in a Relational Database

Topics

Exceptional Handling in Python

Object Oriented Programming with Python

Unit 1: Computational Thinking and Programming

File Handling in Python

Unit 2: Database Management

Advance Programming with Python

Unit 3: Computer Networks

Stack

Python - Databases and SQL

Python - Boolean Algebra

Queue

Project

Python - Communication Technologies

Sorting

Searching

Understanding Data

Database Concepts

Structured Query language (SQL)

Computer Networks

Data Communication

Security Aspects

Project Based Learning

description

Related QuestionsVIEW ALL [13]

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