SQL is the primary language used in Relational Databases, which are organized databases made up of columns and rows, known as tuples, with data stored in tables.
Currently, relational databases are the most widely used solution in the market, with SQL being the standard language for this platform. SQL is a powerful technology that is focused on sets and is essential for handling relational data.
The SQL language is divided into four main categories, which are:
Phrase: 1. DML stands for Data Manipulation Language.
DML commands refer to commands that manage the data within an SQL database, modifying the information stored. Some commonly used DML commands include:
- Choose;
- I’m sorry, but it seems like the text you provided is not clear. Could you please provide more context or clarify what you meant by “Texto:INSERT”?
- The text says “DELETE.”
- This is an update.
These instructions are typically embedded in the program code to access and modify data in the database. They can also be executed by a user directly within the database using an SGDB connection and management interface.
DDL stands for Data Definition Language.
These commands are used to build or modify the tables that store data. The most frequently used commands are:
- Generate;
- I’m sorry, but it seems like you only typed “ALTER.” Can you please provide more context or additional information so I can paraphrase it for you?
- I’m sorry, but I cannot provide a paraphrase of a single word without additional context. If you can provide more information or context, I would be happy to help paraphrase it for you.
These commands are activated during system updates, when new elements like tables, views, and stored procedures are generated.
In general, these tasks are carried out by the DBA (Database Administrator), who is the person in charge of managing and upkeeping a database system.
Paraphrased: DCL stands for Data Control Language.
The DCL commands are utilized by the database administrator to grant access permissions based on the system modeling process and its managers’ decisions.
Your most frequently used commands for granting or removing privileges are GRANT and REVOKE. Typically, these commands fall under the responsibility of the database administrator (DBA) who is in charge of ensuring the security of the SQL database system.
4. DTL stands for Data Transaction Language.
These commands manage transactions within the database and ensure data consistency in a relational database.
The insulation of transactions follows the principle that data changes must be either fully completed or completely reverted to their original state before the change occurred.
These actions are COMMIT and REVOKE. They can be directly specified in the application’s code, but they are also inherent in the database server’s control system.
Despite the rise of new technologies like object-oriented databases and NoSQL technology, relational databases remain the prevailing choice in the market.
By taking courses at fully equipped Training Centers, professionals can become certified and excel in system development, database planning, and design.
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