Learn how to use logical operators (AND OR NOT) in SQL

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Why learn SQL?

1. SQL is the most universal and common used database language.
It powers the most commonly used database engines like PostgreSQL, SQL Server, SQLite, and MySQL.
Simply put,If you want to access databases then yes, you need to know SQL.
2. It is not really difficult to learn SQL.
SQL is not a programming language, it’s a query language. The primary objective where SQL was created was to give the possibility to common people get interested data from database. It is also an English like language so anyone who can use English at a basic level can write SQL query easily.
3. SQL is one of the most sought-after skills by hiring employers.
4. You can earn good money



How much time does it take to learn SQL?
SQL is easy but no one can determine the learning time it takes. It totally depends on you. The method we adopted to help you learn SQL quickly starts from the basics and takes you to advanced level within hours. You can follow the same, but remember you can learn nothing without practicing it. Practice is the only way to learn SQL quickly.

What are the steps I should follow to learn SQL?

1. Start learning from the basics of SQL. The playlist on our channel will cover the basics.
2. Once done with the basic try your hands on advanced SQL. Check out our course on Udemy to learn Advanced features of PostgreSQL at a discounted price: [ Ссылка ]
3. Practice your learnings regularly.


What's the difference between SQL and PostgreSQL?

SQL is a language. Specifically, the "Structured Query Language"
PostgreSQL is one of several database systems, or RDMS (Relational Database Management System). PostgresSQL is one of several RDMS's, others of which are Oracle, Informix, MySQL, and MSQL.
All of these RDMSs use SQL as their language. Each of them have minor variations in the "dialect" of SQL that they use, but it's all still SQL.


Which is better, PostgreSQL or MySQL?

Both are excellent products with unique strengths, and the choice is often a matter of personal preference.
PostgreSQL offers overall features for traditional database applications, while MySQL focuses on faster performance for Web-based applications.
Open source development will bring more features to subsequent releases of both databases.


Who uses these databases?

Here are a few examples of companies that use PostgreSQL: Apple, BioPharm, Etsy, IMDB, Macworld, Debian, Fujitsu, Red Hat, Sun Microsystem, Cisco, Skype.

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