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What is SQL?

SQL, or Structured Query Language, is a programming language designed for managing and manipulating data in relational databases. A relational database is a type of database that organizes data into tables, and SQL can be used to query, insert, update, and modify this data.

SQL was first developed at IBM in the 1970s with a mission to make it easier to manage and analyze large amounts of data. Today, SQL is a standard tool for data management and data analysis in industries such as business, healthcare, science and technology.

SQL Commands​

SQL is made up of commands that can be categorized into a few key areas:

  • DDL (Data Definition Language): This includes commands like CREATE, ALTER, and DROP, which you can use to define or modify the structure of database objects.

  • DML (Data Manipulation Language): This includes commands like SELECT, INSERT, UPDATE, and DELETE, which allow you to manipulate the data within database objects.

  • DCL (Data Control Language): This includes commands like GRANT and REVOKE, which are used to control the access to the database.

  • TCL (Transaction Control Language): This includes commands like COMMIT, ROLLBACK, and SAVEPOINT, which are used to manage transactions within the database.

Why Learn SQL?​

SQL is a fundamental skill for any data professional. Here's why:

  • Universal Language for Data: SQL is used in almost all major relational database management systems, such as MySQL, Oracle, and SQL Server. If you know SQL, you can work with almost any database system.

  • In-Demand Skill: SQL is one of the most sought-after skills in the job market. Whether you're aiming for a role in data analysis, data science, business intelligence, or software development, SQL is likely going to be a critical part of your job.

  • Accessible for Beginners: Unlike some programming languages, SQL is quite easy to understand and learn. Even with no prior programming experience, you can start writing SQL queries and working with databases in a relatively short amount of time.

Getting Started with SQL​

Starting to learn SQL is as simple as downloading a database system and starting to practice SQL commands. Some popular options for practicing SQL include SQLite, PostgreSQL, and MySQL.

In these environments, you can create your own databases, tables, and data, and then practice querying and manipulating this data using SQL.

As you start your journey with SQL, remember to take it one step at a time. Start with understanding the basics of relational databases and simple SQL commands, and then gradually move on to more complex topics like joins, subqueries, and stored procedures.

With persistence and practice, you'll increasingly understand and appreciate the power of SQL in handling and analyzing data. Happy learning!