Difference between revisions of "Kexi/Handbook/Introduction to Databases/What Is a Database?"

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To sum up, you have already got a simple database with one table '''''Contacts'''''.
 
To sum up, you have already got a simple database with one table '''''Contacts'''''.
  
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Latest revision as of 17:01, 7 April 2012

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What Is a Database?

You can define a database as a collection of data on one topic. It is organised in a way allowing to easily browse the information, make changes or add new items.

Look at this diagram for one of the above examples: a simple phone book.


Contact-example.png

The above picture shows a set of two contacts each of which is presented on a separate card. It appears that such a card can constitute a single row in a table:

Contacts table
Name Tel No.
Joan 699 23 43 12
Adam 711 19 77 21

Terms and definitions: A single data which constitutes a part of a greater collection can be called a row or more professionally a record. The collection is normally called a table. Moreover, the most natural name for the table is one describing the data it offers/stores which is Contacts. Furthermore, each row in the table consists of columns often also called fields. In the table Contacts there are two columns (fields): Name and Tel No..

For simple uses a single table can make up a database. Many people consider these two equivalent. As you will see, for real databases we usually need more than one table.

To sum up, you have already got a simple database with one table Contacts.



This page was last edited on 7 April 2012, at 17:01. Content is available under Creative Commons License SA 4.0 unless otherwise noted.