SQL is relatively easy to learn and allows people to quickly learn how to perform queries on a relational database. This simplicity is part of the reason that relational databases now form the majority of databases to be found.
An understanding of relational databases requires an understanding of some of the basic terms... displayed 300 characters
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On its own, data means very little. "43156" is an example.
Information is data that is processed to have a meaning. For example, "43156" is the population of the town of Littlewood.
A database is a collection of tables.
Each table contains records, which are the horizontal rows in the table. These are also called tuples... displayed next 300 characters
This would return a list of the names and address of all people living in county Kildare.
Each record on a table can be assigned a primary key which is normally a number and is also a field in the record...
SQL is relatively easy to learn and allows people to quickly learn how to perform queries on a relational database. This simplicity is part of the reason that relational databases now form the majority of databases to be found...
Tables store information about entities. Entities have characteristics called attributes. Each row in a table represents a single entity: each row is a set of attribute values and every row must be unique, identified by a primary key (an attribute or set of attributes whose values are unique for every row in the table)...
The Information Age has changed the Information Systems industry by making most tasks that would normally require expert knowledge user friendly. Mrs. Linda Feliciano describes how she has seen database software develop over the past 20 years:
"I started working with databases in 1985, while working in an MI Brigade Automation Center...
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