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translated subtopic about relational database

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README_ENG.md
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@ -1452,10 +1452,40 @@ Look for a special [awesome repository](https://github.com/sindresorhus/awesome#
- ### Relational database
The most popular relational databases: [MySQL](https://en.wikipedia.org/wiki/MySQL), [PostgreSQL](https://en.wikipedia.org/wiki/PostgreSQL), [MariaDB](https://en.wikipedia.org/wiki/MariaDB), [Oracle](https://en.wikipedia.org/wiki/Oracle_Database). A special language [SQL (Structured Query Language)](https://postgrespro.com/docs/postgresql/14/sql) is used to work with these databases. It is quite simple and intuitive.
- [SQL basics](./files/databases/sql-cheatsheet.md)
> Learn the basic cycle of creating/receiving/updating/deleting data. Everything else as needed.
- Merging tables
- Querying data from multiple tables
> Operator `JOIN`; Combinations with other operators; `JOIN` types.
- Relationships between tables
> References from one table to another; foreign keys.
- [Subquery Expressions](https://postgrespro.com/docs/postgresql/14/functions-subquery)
> Query inside another SQL query.
- [Indexes](https://postgrespro.com/docs/postgresql/14/indexes-intro)
> Data structure that allows you to quickly determine the position of the data of interest in the database.
- [Transactions](https://postgrespro.com/docs/postgresql/14/tutorial-transactions)
> Sequences of commands that must be executed completely, or not executed at all.
- Command `START TRANSACTION`
- Commands `COMMIT` and `ROLLBACK`
- Working with a programming language
> To do this, you need to install a special driver for your language. For more convenient operation, there are ORM libraries that allow you to execute SQL queries as if you were simply calling methods on the object.
- [Optimization and performance](https://postgrespro.ru/docs/postgresql/14/performance-tips)
<details>
<summary>🔗 <b>References</b></summary>
</details>
1. 📺 [**SQL Crash Course - Beginner to Intermediate** – YouTube](https://youtu.be/nWeW3sCmD2k)
2. 📺 [**SQL Tutorial - Full Database Course for Beginners** – YouTube](https://youtu.be/HXV3zeQKqGY)
3. 📺 [**MySQL - The Basics. Learn SQL in 23 Easy Steps** – YouTube](https://youtu.be/Cz3WcZLRaWc)
4. 📄 [**MySQL command-line client commands**](https://www.mysqltutorial.org/mysql-cheat-sheet.aspx)
5. 📺 [**Learn PostgreSQL Tutorial - Full Course for Beginners** – YouTube](https://youtu.be/qw--VYLpxG4)
6. 📄 [**Postgres Cheat Sheet**](https://postgrescheatsheet.com)
7. 📺 [**Database Indexing Explained (with PostgreSQL)** – YouTube](https://youtu.be/-qNSXK7s7_w)
8. 📺 [**What is a Database transaction?** – YouTube](https://youtu.be/P80Js_qClUE)
9. 📺 [**SQL Server Performance Essentials – Full Course** – YouTube](https://youtu.be/HvxmF0FUwrM)
</details>
<div align="right"><a href="#top">Contents ⬆️</a></div>