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Sort the keys

Exercise and reference answers

Items
  1. Item
    All the contenders
    Category
    Candidate
  2. Item
    All values differ
    Category
    Candidate
  3. Item
    The chosen one
    Category
    Primary
  4. Item
    May be composite
    Category
    Primary
  5. Item
    Points to another
    Category
    Foreign
  6. Item
    May be NULL
    Category
    Foreign
Categories
  1. Item
    Candidate
  2. Item
    Primary
  3. Item
    Foreign
Instructions
Tap each description into the kind of key it describes.

Explanation

_Source: syllabus Computer Science, Ch 8 'Database Concepts'_
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