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Relational databases allow you to store information in multiple (two-dimensional) tables linked by shared data fields called keys. Everyone knows what a simple database is: phone books, product catalogs and dictionaries are all databases. They can be organized or organized in other ways: flat files, hierarchical or network structures or relational tables. Generally, organizations use relational databases to store information. It is a collection of tables composed of columns and rows, similar to a spreadsheet. Each row contains an entry; each column contains all instances of a specific data block for Woodsfield tiley all rows. For example, a typical telephone directory consists of columns containing telephone numbers, subscriber names, and subscriber addresses. Each line contains a number, name and address. This simple shape is called a flat file due to its two-dimensional nature and all data is stored in one file. Ideally, every database has at least one column with a unique identifier or key. Consider the phone book. The subscriber may contain multiple entries, but no phone numbers will be repeated. The phone number is used as a key.
It's actually not that simple. Two or more people using the same phone number can be listed separately in the phone book, which will cause the phone number to appear in two or more locations, so there are multiple rows of buttons that are not unique.

In the simplest database, each record is a row. In other words, the telephone company needs to maintain a separate column for each piece of accounting information. That is, the second subscriber of one phone, the third subscriber of another phone, and so on, depending on how many subscribers need to be added.
This means that every record in the database must have all these other columns, even if they are not used anywhere else. This also means that whenever the company provides new services, the database must be reorganized. Introduced voice dialing service-with the addition of new columns, the infrastructure has also changed. It introduces support for callers, call waiting, etc.-and rebuilds the database again and again. For many years, only the largest companies could afford to buy computers to manage their data. In addition, databases built on static data models and using procedural programming languages ​​(for example) can be too expensive to maintain and not always reliable. The programming language defines the sequence of events that the computer must go through to complete a task. Programming such sequences is very difficult, especially when you must change the database structure or create new types of reports.

In his pioneering work (Data Relational Model for Large Shared Databases, Communication, June 1971), he essentially created and described the concept of relational databases.

A model is proposed that allows developers to divide their database into separate but interconnected tables, thereby improving performance, but with the same appearance as the original database. Since then, he is regarded as the founder of the relational database industry.

The telephone company can use the phone number as the primary key to create a master table and store it along with other basic customer information. The company can define a separate table with columns for this primary key and other services such as caller support and call waiting. She can also create another table to track phone invoices, where each record contains phone number and call cost data. Although this data is stored in different tables, the end user can easily obtain the required information and the required information format. Therefore, the customer service representative of the telephone company can display information about the subscriber's bill, the status of special services, or when the last payment was received on the same screen.
The rules of relational databases, most of which are related to data integrity, update and access. The first two are very simple, even for non-technical users. An information rule specifies that all information in a relational database is represented as a set of values ​​stored in a table. Access guarantee rules specify that you can use table names, primary keys, and column names to access every item of data in a relational database. In other words, all data is stored in the table, and if you know the name of the table, the primary key and the column in which the required data item is located, you can retrieve it at any time. A proposal was made to use a declarative rather than a procedural programming language with relational databases. Declarative languages ​​such as structured query language enable users to essentially tell the computer what steps must be taken by the computer itself to obtain this information from the database. In order to work with a large number of actively used databases, software relational database management systems created by famous manufacturers such as, and. It can only be called interoperable approximately, and the mechanism has been approved as an international standard, allowing you to create complex systems based on databases. The easy-to-use programming interface between the website and the relational database enables end users to add new records and update existing records, and generate reports for various services such as online transactions and access to online library catalogs.
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