Unit 23

Database and SpreadsheetsPrepared by :Nahed Al-Salah

Intoduction A database is needed to store information so

that it can be searched and sorted in various ways.

Each item of information stored in a field. A collection of related fields form a record. Simple searches can often be created by

allowing the user to type the required field information into a blank record and pressing a search button.

More advanced programs usually use a query language known as SQL ( structural Query Language.

This allows users to type statements using logical operators to specify the search conditions.

Meaning Logical operator

Both condition A and B are true A.AND.B

Either condition A or condition B or both are true

A.OR.B

Condition A is not true .NOT.A

Spreadsheet A Spreadsheet program is used for calculating formulae.It made up of a grid or array of rectangular boxes called cells as shown below :

The columns are labelled A,B,C… The rows of cells numbered 1,2,3… To refer to a particular cell e.g A1 , B1,C1………

D C B A

1

2

3

ExercisesAt Textbook