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Monthly Archives: September 2013

Downloads

pcdownloads

From this page you can download some apps made by me …

1. Basics of Databases

2. Electricity Fundamentals

 

1. Basics of Databases

Ana Ispasoiu, CSB

29.09.13

In general:

• A database is a persistent, logically coherent collection of inherently meaningful data, relevant to some aspects of the real world.

In other words,

A database is any collection of related data.

For example, we want to have some records of some students from a school. A simple table would look like this:

Students

Name Surname Age Gender
John Stewart 13 M
Andrew Thorne 13 M
Emma Roberts 16 F

Fig.1 A simple database table of students with attributes and records

 Databases have:

● Entities

● Attributes

● Relationships (cardinality)

Entity is the table in general. In Fig.1, the entity is the table ‘Students’ itself.

Attribute is the property that describes the entity. In the above example, there are 4 attributes (the columns with name, surname, age,and gender).

A record is a row in a table that contains data. Without them, we won’t have any data in our entity.

…..

More details and the whole article you can have if you register on my blog and download

this application and presentation from here.

If you are asked for a setup password, please send me an e-mail.

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2. Electricity Fundamentals

If you are interested in electricity you can read a presentation with the basics from here. You need to be logged in to view this.

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