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Spreadsheets And Database Models – A Comparison
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Spreadsheets And Database Models – A Comparison

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    Spreadsheets And Database Models – A Comparison Spreadsheets And Database Models – A Comparison Presentation Transcript

    • Spreadsheets and Database models – A Comparison
    • Structure
      • Spreadsheets
      • Table made up of individual cells
      • Databases
      • Collection of tables storing related data
      • Each table contains columns/fields
      • Also Queries, reports, forms
    • Additional Constraints
      • Spreadsheets
      • Enforces data format constraints
      • Numerical, currency, date/time, text formats
      • Databases
      • Same formats as spreadsheets
      • Also minimum and maximum field size, required field, default values assigned and validation rules
    • Spreadsheet constraints example the specified information only Each Column is formatted to display $99.00 19/09/2009 ? 76.00 $85.00 19/09/2009 Cow 52.00 $47.00 19/09/2009 My 234.00 $56.00 19/09/2009 Is 5423.00 $13.00 19/09/2009 Where 1.00 Currency Date Text Numbers
    • Data Manipulation
      • Spreadsheets
      • Static and dynamic visualizations
      • Pivot Tables
      • Extensive mathematical calculations
      • Databases
      • Few graphical visualizations
      • Queries, reports
      • Limited calculation functions in reports
    • Reports example This report based the this query
    • Calculations Example Num A + Num B = Total       17 8 9 10 3 7 10 5 5 16 6 10 22 2 20 Total Num B Num A
    • Limitations
      • Spreadsheets
      • Data in large spreadsheet systems redundant and unreliable
      • Multiple copy complications
      • One user at a time on centrally stored spreadsheets
      • Databases
      • Eliminates spreadsheet problems
      • Changing user requirements necessitates a new database
    • Development
      • Spreadsheets
      • Simple to create.
      • Requires considerable user maintenance
      • Multiple spreadsheets -> inconsistencies occur
      • Databases
      • considerable time and energy to create.
      • Little maintenance needed
      • need to be replaced when they become outdated.