Hierarchical Structure of Data

 

Syllabus Detail

  • The hierarchical structure of data; character/byte, field, record, table/relation. 11 ATAR, 12 GEN

Character / Byte

  • the smallest possible item you can see on a screen is character
  • the number 1, is a character and seen on the screen
  • for the number 1, inside the computer is binary 00000001

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 Field

  • holds a single value for an object
  • eg a field in a database is firstName
  • eg another field in a database is LastName

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Record

  • shows the data for one object
  • usually viewed in a single row
  • eg in a row might be the following

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Table /Relation

  • a table is a collection of records
  • a table is also a collection of rows

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