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Summary

Summary Information Technology Theory
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  • Course
  • Information Technology
  • Institution
  • 12th Grade
  • Book
  • IT is Gr8! @ Grade 12

These summaries provided the perfect solution to obtain all the necessary information without needing to open the book. These summaries cover the CAPS gr. 12 IT theory syllabus. Summaries perfect to use before starting with past papers. *Buy bundle for complete set

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  • Yes
  • November 23, 2024
  • 3
  • 2024/2025
  • Summary

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  • Information Technology
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Module 4.1
Database design and concepts
Relational Databases
 Select: when we choose what entities we want to record and what data about that entity
is important
 Structure: what tables we need and what the relationship between the tables are

Normalization

 Formal rules applied in a specific order to ensure databases are designed correctly
 Series of steps that need to be followed
 Third Normal Form: no redundant data: databases we work with

Unprocessed data – data where no entities, attributes or relationships have been identified

Basic Database design
 Faster, easier, more accurate, more reliable, more flexible and lest costs

1. Selecting the data
 What data you need and where the data can be obtained from
 Existing documents: take note of every distinct piece of information
and that it has an appropriate heading
 Existing workflows: order in which things get done. Might not appear in
other documentation. Identify data needed to monitor processors
 Business plan: document which outlines the strategies to used to ensure
that your business is a success.
2. Structuring data
 Place data of each entity in separate tables, determine relationship and link
tables with foreign key

Insert Anomaly Prevents user from capturing data
Delete Anomaly Deleting one piece of data result in the removal of unrelated data
Update When data changes it has to be altered in multiple records
Anomaly

 Increases efficiency
 Minimizes wastage of storage and memory
 Eliminates errors

Data maintenance – keep data current (adding, deleting, and updating records)

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