With the great sophistication of the technologies used, and with increasing reliance on the Internet, developers had to develop a portfolio of data in a way that could be used to make the best and easiest way to use information. Data is essential, especially today; processing results And with the utmost speed of business owners, where through these data processing can make appropriate decisions to them in their different worlds and functions.Fly for less with Skyscanner
The concept of the database is not different from the concept of the staff data record in the Human Resources Department. It is a logical table that is interconnected with logical relationships written in a specific programming language. Each table consists of a set of fields (in English: Fields are logically linked to each other to facilitate the retrieval and retrieval of information from the database using code commands. United Airlines flight deals
Importance of databases
The databases are of great importance in the various works, and their importance is highlighted in many points, including:
· The databases greatly help to speed up the process of accessing the data they contain.
. Instead of searching here and there, the necessary data are collected to facilitate access to and processing or to employ them in different jobs in the future. Carmel #1 Car and Limousine Service in America
· The databases make it very easy to modify this data in the future, and greatly facilitate the process of making the necessary updates, in addition to facilitating the processes of humping or adding.
· Databases help answer any question or query directly related to the data stored and stored within these Rules, at any time.
· Helps to format and aggregate large data hierarchically for easy management and retrieval.
Databases or file system?
The data system is easy to store, speed and reduce useless information. The file system is difficult to store. It requires a lot of storage space, it is difficult to find the required files quickly and accurately, and countless others, and you can go to Google and write in the search engine why to use the database for the required information. Why use a taxi?
The databases are written in different languages and programs, such as MySQL, Microsoft Access, PHP, and Python. There are also different environments for building databases, most notably Oracle, Firebird, Postgres, Sybase, Microsoft SQL, Informix, and many other environments.
SQL Structured Query Language (SQL) has a set of instructions or commands that can be divided into three groups according to their nature:
· DML: The language of data processing, and has the following instructions:
v SELECT to retrieve some records from one or more tables.
v INSERT to create records.
v DELETE to delete records.
v UPDATE to modify the records.API Tracking Link for Netherlands
· DDL is the data definition language and has the following instructions:
v CREATE to create a table, views, index or any other object.
v DROP to delete a table or any other purpose.
v ALTER to modify a table or any other purpose.Check out Skyscanner’s Deals Updated Weekly!
· DCL: The language of data control, and has the following instructions:
v GRANT gives privileges to the user.
v REVOKE takes privileges from the user.
. You can learn this language from the following references:
v Learning SQL: Author: Now Paulo.
v Head First SQL: Author: Lynn Beighley.Find the top International flight deals up to 55% off
The database consists of four basic components:
Installation of databases
The databases have special combinations, including relational structures, which depend on specific and defined elements of different data, such as the value of an element based on calculations on other elements. The second structure is structural, and this structure depends on the organizational relationship between the data elements. The third structure is the structure known as the pyramid structure, and this structure is based on the existence of hierarchical relationships between the different elements. For example, several elements of different data can fall under one element.Skyscanner’s daily flight deals up to 55% off
Tasks and functions of database manager
The Database Administrator (DBA) is the most important person working in the database department in any business environment, such as companies or banks, because he is responsible for distributing all functions and functions to the rest of the team responsible for them.iPage Web Hosting.
He is also responsible for the performance and readiness of databases, And easy access by programmers or users, so be aware of how the database works very large, and has the expertise to qualify for this sensitive position, in addition to work in securing the databases and protection from electronic breakthroughs that can be exposed His z and must have good interpersonal skills to communicate with others so that he ensures excellent results in a relaxed atmosphere within the team.
The database manager’s work is usually at the same location as the database itself. He does not need to work elsewhere and is responsible for giving the programmers and users the authority to access, modify, and monitor the database. Many certificates allow its users to serve as a database manager such as MySql, Oracle Database Administrators, and Microsoft Certified Certificate for Database Managers (MCDBA).Extremely Cheap Last Minute Flights up to 51% Off on ETripmakers