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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
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