Databases
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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

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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


Databases

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


Databases

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.


Databases

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


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