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Databases - PowerPoint PPT Presentation


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Luke Bissett. Databases. Databases are like Excel tables Database tables consist of columns and rows, each column contains a different type of attribute Each row corresponds to a single record. Databases you need to retrieve all records that match certain criteria.

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databases

Luke Bissett

Databases

  • Databases are like Excel tables
  • Database tables consist of columns and rows, each column contains a different type of attribute
  • Each row corresponds to a single record.
  • Databases you need to retrieve all records that match certain criteria.
  • You can update records in bulk
  • You can perform complex aggregate calculations
slide2

How we use databases

  • Use a spreadsheet page such as Microsoft access
  • Data base can be use in a school for recording names of the student
  • Can be used on websites
  • We use databases in shops e.g. check outs, barcodes
  • Databases can be used on mobile phones e.g. contact list
slide3

Why We Use Databases!!!!

  • Organize your data in a logical manner.
  • Fast and efficient data retrieval
  • Rapidly retrieve the data you want
  • Enables you to break data into specific parts.
  • One enormous task to find specific answers if in text file.
  • Data remains consistent when you add, update, or delete data.
  • It is very quick and easy to find information.
  • It is easy to add new data and to edit or delete old data.
  • Data can be searched easily
  • Data can be sorted easily
  • Data can be imported into other applications.
  • More than one person can access the same database at the same time
  • Security may be better than in paper files.
slide4

The Structure of Databases

  • Two main structures of a database are tables and Indexes
  • Tables are the structures that store your data
  • Each table is composed of a number of fields (columns)
  • Information would be stored in what we call rows.
  • Fields in the database has a type associated with it
  • Common types are text, numeric and blob
  • Some databases are very strict about the type of data that can be stored in a field