What are databases?

Database

A database is defined as an organized mechanism for storing, managing, and retrieving information. It is a large amount of indexed digital information that can be searched, compared, referred to, or changed at an ideal speed. It is created and maintained using the database programming language. Data, and one of the most common languages ​​used in databases is the SQL language. Data is stored in the form of a file, or a group of files on a disk, magnetic tape, optical disk, or any secondary storage device, and the database management system (in English: Database Management System) extracts information from the database to answer searches.

Database components

The database consists of several main components, which are as follows:

• Schema: A database contains one or more schemas, which is a collection of one or more data tables.
• schedule: Each table contains a set of columns that are similar to the columns found in spreadsheet programs. The table can contain less than two columns, or up to a hundred columns or more, and their number depends on the type of data stored in the tables.
• Column: Each column contains one of several types of data or values, such as: numeric values, dates, integer values, and alphanumeric values ​​(in English: Varchar).
• the line: Data in a table is inserted into rows, which are similar to rows in tabular programs. There are usually thousands of rows in a table.

Applications on databases

Databases are used in many applications. Commercial database applications include airline reservations, production management functions, medical records in hospitals, and legal records for insurance companies. They are usually the largest databases used by government agencies, business organizations, and universities, and may contain Databases contain several texts, such as: summaries, reports, laws, wire services, newspapers, magazines, encyclopedias, and manuals of various kinds.

Reference databases contain indexes that serve as a guide to the location of information in books, periodicals and other published publications. There are currently thousands of databases available to everyone, covering multiple topics, such as: law, medicine, engineering, News, current events, games, classified ads, and educational courses.