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Candidate or primary key

Exercise and reference answers

Left
Candidate
Items
  1. Region
    Candidate
    Item
    Could be chosen
  2. Region
    Candidate
    Item
    May be several
  3. Region
    Primary
    Item
    Actually chosen
  4. Region
    Primary
    Item
    One per table
  5. Region
    both
    Item
    Values unique
  6. Region
    both
    Item
    Identifies a row
Right
Primary
Instructions
Drop each description into where it belongs.

Explanation

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