Introduction to Databases

Introduction to Databases - Introduction to Databases...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Introduction to Introduction to Databases Databases
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Add, change,  and delete  data Create database Sort and  retrieve  data Create forms  and reports What is a database ? Database  software  allows you to Collection of  data organized  so you can  access, retrieve,  and use it Database  software also  called  database  management  system (DBMS)
Background image of page 2
Data Integrity Degree to which data is correct The more errors the data contains, the lower its integrity Garbage in = garbage out (GIGO)  Incorrect data in = incorrect information out Garbage  out Garbage  in Data  integrity  is lost
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Useful Accessible Organized The Qualities of Valuable Information Timely Verifiable Accurate Cost-effective
Background image of page 4
The Hierarchy of Data Database contains files  file contains records record contains fields field contains characters Field : combination of one or more related  characters Smallest unit of data user accesses Field size  defines the maximum number of characters  a field can contain Field name  uniquely identifies each  field Data type  specifies kind of data field  contains
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/08/2011 for the course CIS 0835 taught by Professor Forman during the Spring '11 term at Temple.

Page1 / 20

Introduction to Databases - Introduction to Databases...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online