Normalisation
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The document provides instructions for a lesson on database normalization. It will teach about 1st, 2nd, and 3rd normal forms, with the goals of organizing data efficiently, eliminating redundant data, and ensuring only related data is stored together. Learners will understand the rules of each normal form and practice converting databases between the forms.
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Normalisation
By the end of the lesson, learners will understand the concepts of 1st, 2nd, and 3rd normal form and practice designing databases according to those forms. Specifically, all will understand the different normal forms, most will design databases in each form, and some will convert databases between the normal forms. The document then provides examples and tasks for learners to practice normalizing databases.
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Normalization in SQL | Edureka
YouTube Link: https://youtu.be/ABwD8IYByfk
** MySQL DBA Certification Training: https://www.edureka.co/mysql-dba **
This Edureka PPT on 'What is Normalization' will help you understand the basic concepts of Normalization in SQL and Databases and how it helps in organizing data and data redundancy in SQL with examples.
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Normalization and three normal forms.pptx
Normalisation dbms computer science computer technology computer networks BCA bachelor of computer applications, normalisation is used to reduce the redundancy to avoid the anamolies there are 5 types of normal forms 1st normal form, second normal form, third normal form, boyce codd normal form, 4th normal form and fifth normal form
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Systems software and applications packages
This document describes systems software and applications packages. It defines systems software as programs that control hardware operation including the operating system, utility programs, programming tools, and library programs. It provides examples of utility programs. It explains programming tools and library programs. It defines applications packages as programs consciously used by users to perform tasks. It provides examples of general purpose, specialist, and bespoke application software. Finally, it provides instructions for an assigned task to design a set of playing cards with computer system information.
Components of a computer system
A computer system consists of hardware and software components that work together to take inputs, process them, and produce outputs. The hardware components include input devices to enter data, storage devices to store data and software long-term, and output devices to present the processed data to users. Examples of input devices are keyboards, mice, and microphones. Storage devices include hard drives, DVDs, CDs, and flash drives, which represent data using magnetic domains, lasers, or electric charge. Output devices such as monitors, printers, and speakers are used to display or present the output of the computer's processing to users.
Key database terms
A relational database contains multiple tables that are linked together through key fields. For example, a library database could have tables for customers, books, and book lendings that are connected using unique IDs. This avoids data duplication and allows easy access to and reporting on customer and book information.
Key database terms include: attributes, which are the field names and data types in tables; primary keys, which uniquely identify rows; composite keys, which identify rows using multiple fields; foreign keys, which link tables and are primary keys in other tables; and referential integrity, which ensures consistent updates across related tables.
L1
The document provides instructions for students to create a spreadsheet model that tracks advertising costs. It outlines the learning outcomes which are for students to create a formatted spreadsheet that models advertising costs with different data types. It then explains cell formats and provides an example task for students to create a spreadsheet that tracks the cost of printing different types of advertisements.
L2
The document discusses using spreadsheets to perform calculations and modeling. It provides instructions on tasks for students to complete a spreadsheet to calculate advertising costs using formulas, then produce a report showing how changing variables affects total costs. Students are expected to review their own work using comments in the spreadsheet to self-evaluate their learning.
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Normalisation
- 1. Prepare for Learn Text about stuff
- 2. Learning Outcomes By the end of today’s lesson; • All of you will understand what 1st, 2nd and 3rd normal form are • Most of you will design a database in 1NF, 2NF and 3NF • Some of you will convert a database between 1NF, 2NF and 3NF
- 3. Normalisation Normalisation is when we ensure a database is working in its most efficient way. Its main purpose is to; • Organise the data efficiently • Eliminate redundant data • Ensure that only related data is stored in a table.
- 4. 1st Normal Form The rules for 1NF are; • There are no columns with repeated or similar data • Each data item is atomic • Each row is unique • Each field has a unique name
- 5. 1NF Example Which is NOT in 1NF?
- 6. 2nd Normal Form The rules for 2NF are; • Non-key attributes must depend on every part of the primary key • The table must already be in 1NF
- 7. 2NF Example How can we change this 1NF database to 2NF?
- 8. 3rd Normal Form The rules for 3NF are; • There are no non-key attributes that depend on another non-key attribute • The table must already be in 2NF
- 9. 3NF Example
- 10. Task 1 On your whiteboards convert this database to 1NF.
- 11. Task 2 On your whiteboards convert this database to 2NF. Once you have done this create a design for a database in 3NF for an online game database that stores player details, games they play and high scores (max 3 games).
Editor's Notes
- 1-No2-At least 1NF3-No4-Yes