Computer ScienceChapter 9: Introduction to Data Access
Primary Keys and Indexes
A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
Learning objectives
- Define and explain primary keys and indexes in clear language.
- Use the important technical terms accurately.
- Describe the working process in the correct order.
- Apply the concept to a realistic computing example.
- Test or evaluate the result and state a limitation.
Definition
A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
Important terms
- Primary keys and indexes
- A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
- Primary
- A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
- indexes
- A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
- A primary key prevents duplicate identity
- A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
Overview
Learn the concept through terminology and working:
Terminology and Concept
Terminology: use Primary keys and indexes, Primary, indexes, A primary key prevents duplicate identity precisely. Define each term before using it in an explanation, algorithm, program, or comparison.
Examples A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
Working and Application
Working method: first identify the input or starting state for primary keys and indexes; then apply the rule or process in a clear order; finally inspect the output, test an edge case, and explain any limitation.
Examples Example: apply primary keys and indexes to a small school, home, or software problem and trace the result.
CONCEPT — What it means
A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
TERMINOLOGY — Words to use
Terminology: use Primary keys and indexes, Primary, indexes, A primary key prevents duplicate identity precisely. Define each term before using it in an explanation, algorithm, program, or comparison.
WORKING — How it operates
Working method: first identify the input or starting state for primary keys and indexes; then apply the rule or process in a clear order; finally inspect the output, test an edge case, and explain any limitation.
EXAMPLE — Apply it
Example: apply primary keys and indexes to a small school, home, or software problem and trace the result.
In simple words
Do not memorise the name 'Primary keys and indexes' without explaining what information enters, what process occurs, and what result is produced.
Key points
- Primary keys and indexes
- Primary
- indexes
- A primary key prevents duplicate identity
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Primary Keys and Indexes
Sticky Notes · Quick Revision
Concept
- A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
Terminology
- Terminology: use Primary keys and indexes, Primary, indexes, A primary key prevents duplicate identity precisely. Define each term before using it in an explanation, algorithm, program, or comparison.
Working
- Working method: first identify the input or starting state for primary keys and indexes; then apply the rule or process in a clear order; finally inspect the output, test an edge case, and explain any limitation.
Example
- Example: apply primary keys and indexes to a small school, home, or software problem and trace the result.
Common Mistake
- Do not memorise the name 'Primary keys and indexes' without explaining what information enters, what process occurs, and what result is produced.
Exam Tip
- Define the concept, name its parts, explain the working in order, then add and trace one correct example.
60-second revision
- A primary key prevents duplicate identity; indexes speed retrieval but add storage and update work.
- Working method: first identify the input or starting state for primary keys and indexes; then apply the rule or process in a clear order; finally inspect the output, test an edge case, and explain any limitation.
- Example: apply primary keys and indexes to a small school, home, or software problem and trace the result.
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