SQL Primer

Relational Algebra

Free · Designed for iPad

A very first insight into the database theory on your iPhone, iPad or iPod touch. 1970 E.F. Codd has started a revolution with his paper 'A relational model of data for large shared data banks, Communications of the ACM, Volume 13, Issue 6 (June 1970)' that finally led to the today's omnipresent database query language SQL. This little app shows some primitive and derived operations with the following information: * SQL92 and SQL86/89 sample queries, * the results of the queries and * appropriate descriptions. Furthermore the SQL test script that has been used for the calculation of the samples can be displayed. The app is interesting for the first contact with the database subject and for all who are using SQL86/89 queries for over two decades now and finally want to change to SQL92 also ;)

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• Supports new screen sizes • Updated design (UI, Graphics, etc.) • Dark Mode support • Support for Spotlight search • Supports multiple windows (iPadOS)

Version 3.0

The developer, Dr. Ralph Heider, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    • Size
      • 34 MB
    • Category
      • Education
    • Compatibility
      Requires iOS 13.4 or later.
      • iPhone
        Requires iOS 13.4 or later.
      • iPad
        Requires iPadOS 13.4 or later.
      • iPod touch
        Requires iOS 13.4 or later.
      • Mac
        Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
      • Apple Vision
        Requires visionOS 1.0 or later.
    • Languages
      • English and German
    • Age Rating
      4+
    • Provider
      Dr. Ralph Heider
      • Dr. Ralph Heider has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
    • Copyright
      • © Kay Heider, Dr. Ralph Heider
  • Developer Website
  • Privacy Policy

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