SQL (Structured Query Language) is one of the most important and widely used programming languages for working with databases. In this article, we will introduce you to some of the best websites where you can learn SQL from scratch and gradually advance to a professional level.
SQL is primarily used to manage, query, and control databases. Unlike general-purpose programming languages such as C, Swift, Python, and Java, SQL is a declarative language, meaning that you specify what data you want to retrieve or what operation you want to perform rather than describing every step required to execute it.
With SQL, you can insert, retrieve, update, and delete data stored in database tables. These tables are made up of columns and rows, allowing databases to organize and manage large amounts of information efficiently.
SQL can also work with different types of data, including numeric, text, and binary data, and allows you to connect related tables using different types of JOIN operations, such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
So, if you are looking for the best way to learn SQL from scratch, practice your database skills, and eventually reach an advanced level, this article is for you!
SQL Bolt
SQLBolt is an excellent educational website for beginners who want to learn SQL from scratch. It offers a collection of interactive lessons that introduce learners to the fundamentals of SQL while providing hands-on exercises alongside each explanation.
This allows you to practice what you learn immediately and build your SQL skills through practical experience.
The website is divided into two important sections:
- Interactive Tutorial: This section is designed for beginners and includes 19 interactive lessons covering the essential concepts you need to get started with SQL.
- More Topics: This section provides additional lessons covering more advanced SQL topics, making it useful for learners who want to continue developing their database and SQL skills after completing the beginner lessons.
SQL Course
The website covers several important SQL topics that you should understand well as you learn how to work with database tables. These include:
- Creating a table
- Selecting data
- Inserting data into a table
- Updating records
- Deleting data
- Dropping a table
In addition to explaining these essential SQL commands, the website gives you plenty of opportunities to practice what you learn. This hands-on approach helps you become more confident in using SQL and performing different database operations in real-world situations.
Whether you are learning SQL for your professional career or studying it as part of a university program, especially if you are majoring in Computer Science, Information Technology, or a related field, practicing these skills can help you apply SQL more effectively and accomplish a wide range of database-related tasks.
SQL Server Tutorial
This website is one of the most popular platforms for learning SQL from scratch to an advanced level. It features 12 main sections, with each section focusing on a different topic related to SQL Server. The sections include:
Getting Started with SQL Server
This section provides a collection of beginner-friendly lessons covering the essential concepts you need to know when getting started with SQL Server.
SQL Server Basics
Here, you will learn the fundamentals of SQL Server and how to use Transact-SQL (T-SQL) to work with databases and perform essential database operations.
SQL Server Views
This section discusses the advantages and disadvantages of database views. You will also learn how to work with views effectively and understand how they can be used in SQL Server.
SQL Server Indexes
In this section, you will learn everything you need to know about SQL Server indexes and how to develop an effective indexing strategy. You will also learn how indexes can help improve query performance.
SQL Server Stored Procedures
This section teaches you how to develop complex stored procedures using Transact-SQL structures, allowing you to perform advanced database operations more efficiently.
SQL Server User-Defined Functions
You will learn about SQL Server user-defined functions, including scalar-valued functions and table-valued functions. These functions can help simplify development and make database code more organized and reusable.
SQL Server Triggers
This section introduces SQL Server triggers, which are special types of stored procedures that are automatically executed in response to specific database or server events.
SQL Server supports three main types of triggers:
- DML triggers
- DDL triggers
- Logon triggers
SQL Server Aggregate Functions
Here, you will learn about SQL aggregate functions, which are used to process data from multiple rows and return a single value, such as a sum, average, minimum, or maximum.
SQL Server Date Functions
This section focuses on SQL Server date and time functions, which are widely used for processing and manipulating dates and times efficiently.
SQL Server String Functions
This section provides a collection of useful SQL Server string functions that allow you to manipulate and work with text and character strings effectively.
SQL Server System Functions
Through this section, you can learn about commonly used SQL Server system functions. These functions can return information about objects, values, configurations, and other system-related data in SQL Server.
SQL Server Window Functions
Finally, this section introduces SQL Server window functions, which allow you to perform calculations across a set of related rows while still returning individual rows for each record. They are particularly useful for advanced data analysis and reporting.
With these 12 sections, the website provides a comprehensive learning path for anyone who wants to learn SQL Server from beginner to advanced level, combining fundamental concepts with more advanced database features and techniques.
SQL Easy
This website provides a comprehensive collection of the SQL commands, functions, and techniques you may need when creating, designing, and working with databases. When you first open the website, you will find a wide range of SQL topics and examples covering essential database operations, including:
- SELECT
- SELECT specific columns
- WHERE … Equals
- WHERE … Greater than
- WHERE … Greater than or equal
- AND
- OR
- IN
- DISTINCT
- ORDER BY
- LIMIT – Number of returned rows
- COUNT(*)
- COUNT(*) … WHERE
- SUM
- AVG
- MAX and MIN
- GROUP BY
- Nested queries
- NULL
- Date
- INNER JOIN
- Multiple JOINs
- JOINs with WHERE
- LEFT JOIN
- Table aliases
- Column aliases
- Self JOINs
- LIKE
- CASE
- SUBSTR
- COALESCE
These topics cover many of the fundamental SQL commands and database operations that beginners need to master. By practicing them step by step, you can build a strong foundation in SQL and become more confident when working with databases and writing SQL queries.
SQL Zoo
When you first visit this website, you may notice that its interface looks somewhat similar to Wikipedia. It provides a collection of specialized SQL lessons and exercises that allow you to learn and practice SQL for free.
Another useful feature is that the website currently supports three languages:
- English
- Chinese
- Japanese
The learning process is simple and well organized. The website presents the lessons first, allowing you to study and understand the concepts before moving on to the quizzes and tests. Once you have completed the lessons, you can take the available quizzes to test your knowledge and see how well you have understood the material.
The website also includes a Reference section, which provides a collection of the sources and references used throughout the learning materials.
With its free lessons, practical exercises, quizzes, and multilingual support, the website can be a useful resource for anyone who wants to learn SQL online and practice SQL skills for free.
Learn SQL Online
This website is designed for both beginners and advanced learners, making it a useful & free resource for anyone who wants to learn SQL from scratch and progress to an advanced level. The platform separates its beginner and advanced content, allowing learners to follow a structured path based on their current skill level.
Learn the Basics
In the Learn the Basics section, you will find lessons covering the following essential SQL topics:
- Selecting Data — retrieving specific data from a database.
- Creating Tables — learning how to create database tables.
- Inserting Rows — adding new records to a table.
- Updating Rows — modifying existing records.
- Deleting Rows — removing records from a table.
- Joining Tables — combining data from multiple tables.
- GROUP BY — grouping rows based on specific values.
- Aggregate Functions — performing calculations on multiple rows to return a single result.
- The HAVING Statement — filtering grouped results.
- DISTINCT Queries — retrieving unique values without duplicates.
- ORDER BY — sorting query results in a specific order.
Advanced SQL Topics
Once you have mastered the basics, you can move on to the advanced SQL section, which covers topics such as:
- String Operations
- INNER and OUTER JOINs
- The UNION Statement
- The CASE Statement
- Combining INSERT INTO and SELECT
- Subqueries
- Indexing
- Altering Tables
- Views
- Window Functions
By separating beginner and advanced lessons, the website provides a clear learning path for anyone looking to learn SQL from scratch, improve their database skills, and progress toward an advanced level.
T-SQL Tutorial
This website serves as a comprehensive T-SQL tutorial designed for both beginner and advanced developers.
It covers the main areas of T-SQL (Transact-SQL), starting with basic database operations such as:
- SELECT — retrieving data
- INSERT — adding data
- UPDATE — modifying data
- CREATE — creating database objects
- DELETE — removing data
The website also covers more advanced topics, including stored procedures, functions, triggers, and views.
SQL Tutorial
In the SQL Tutorial section, you will find several useful subsections, including:
- SQL Examples — practical examples of SQL commands and queries.
- SQL Server Examples — examples and practical applications for SQL Server.
- T-SQL Examples — examples demonstrating how to use Transact-SQL.
SQL Server
The SQL Server section is divided into three main subsections:
SQL Server Query
This section covers various SQL Server query operations and clauses, including:
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- GROUP BY
- HAVING
- ORDER BY
- WHERE
SQL Server Triggers
This subsection provides explanations and practical examples to help you understand SQL Server triggers and how they work. It covers topics such as:
- CREATE TRIGGER Syntax
- CREATE DML Trigger Example
- ALTER TRIGGER Syntax
- ALTER DML Trigger Example
- DROP Trigger Example
- ENABLE Trigger Example
- DISABLE Trigger Example
- RENAME Trigger Example
SQL Server Views and Procedures
The final subsection focuses on important SQL Server features, including:
- CREATE VIEW
- ALTER VIEW
- Modify Data in a View
- Rename View
- DROP VIEW
- CREATE PROCEDURE
- CREATE FUNCTION
- Call Stored Procedure Example
- Interview Questions
SQL Interview Questions
The Interview Questions section provides a collection of questions that you may encounter during a SQL or SQL Server job interview, along with answers to help you prepare and test your knowledge before applying for a position.
The website also allows you to download its content as a PDF, giving you a convenient reference that you can save and return to whenever you need to review SQL and T-SQL concepts.
With its combination of tutorials, practical examples, advanced topics, interview questions, and downloadable PDF resources, this website can be a useful learning platform for anyone who wants to learn T-SQL and SQL Server from beginner to advanced level.
MSSQLTips
This website offers a wide range of sections, each designed for a specific purpose, making it a valuable resource for anyone who wants to learn SQL from beginner to advanced level. The main sections include:
- Join — This section allows you to join the website’s community and participate in the content and discussions available on the platform.
- Beginner — Here, you will find a collection of lessons and articles specifically designed for SQL beginners.
- Tutorials — This section provides a variety of tutorials and guides related to SQL Server.
- DBA — This section covers the essential knowledge and resources you need if you want to become a Database Administrator (DBA).
- T-SQL — This section helps you learn and practice Transact-SQL (T-SQL).
- Analytics — Here, you will find lessons and resources related to data and database analytics.
- Cloud — This section covers cloud database technologies and platforms, including AWS and Microsoft Azure.
- Tools — This section focuses on useful tools for data quality, database performance, SQL diagnostics, and web database performance.
- Search — You can use this feature to search through the website’s content and quickly find the SQL topics or resources you need.
With its diverse sections and specialized resources, the website provides a comprehensive learning environment for anyone interested in SQL, SQL Server, T-SQL, database administration, analytics, and cloud technologies.
Conclusion
We hope this article has helped you discover some of the best websites to learn SQL online for free. Whether you are a complete beginner or looking to improve your existing SQL and database skills, these resources can help you learn at your own pace and gain valuable practical experience.
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