Concepts of Data Bases
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Transcript of Concepts of Data Bases
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Basic Concepts of Data Bases
Presented By Danial MasoodReg #1421-310031
&Bilal Mushtaq
Reg #1421-310033
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Introduction to Database
A database is any organized collection of data. Some examples of databases you may encounter in your daily life are: ◦Phone Contacts ◦airline reservation system ◦papers in your filing cabinet ◦Banking Record.
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Data vs. information:What is the difference?
What is data?◦ Data can be defined in
many ways. Information science defines data as unprocessed information.
What is information?◦ Information is data that
have been organized and communicated in a coherent and meaningful manner.
◦ Data is converted into information, and information is converted into knowledge.
◦ Knowledge; information evaluated and organized so that it can be used purposefully.
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Why do we need a database? Keep records of our:
◦ Clients◦ Staff◦ Volunteers
To keep a record of activities and interventions;
Keep sales records; Develop reports; Perform research Longitudinal tracking
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What is the ultimate purpose of a database management system?
Is to transform
Action
Knowledge
InformationData
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More about database definition
What is a database? A structured set of data held in a
computer, especially one that is accessible in various ways.
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Let’s explore some examplesOutlook contacts
GIS-GPS systems
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Some models about DatabaseNon-relational database
Relational database
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Non Relational DatabasesNon-relational databases place
information in field categories that we create so that information is available for sorting and disseminating the way we need it. Example: a spread sheet
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Relational Database
In relational databases, fields can be used in a number of ways (and can be of variable length), provided that they are linked in tables. It is developed based on a database model that provides for logical connections among files (known as tables) by including identifying data from one table in another table
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Some DefinitionsA File: A group or collection of similar records,
A record book: a “Hawlet Packard" of data records, like address lists, inventory lists, classes
A field: one category of information, i.e., Name, Address, Semester Grade, Academic topic
A record: one piece of data, i.e., one student's
information, a recipe, a test question
A layout: a design for a database that contains field names and possibly graphics.
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Fundamental building blocksTables comprise the fundamental building blocks of any database. If you're familiar with spreadsheets, you'll find database tables extremely similar. Take a look at this example of a table sample database:
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Data Entry –considerationsBarcode scanners
◦USB or◦Wireless attached to
a Palm or Pocket PCPocket PC
◦Wi-Fi 802.11g, Bluetooth
◦Wireless networks (real-time on demand systems)
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