• SQL Tutorials

    SQL is an intuitive programming language with broad application scope, so solid SQL skills are essential for any data scientist. With our hands-on tutorials, you can learn the basics of SQL for free and build your relational database knowledge.

    Featured Articles

    What Are Duplicate Records in SQL?

    SQL Tutorials

    What Are Duplicate Records in SQL?

    Duplicate records in SQL, also known as duplicate rows, are identical rows in an SQL table. This means the values in each column coincide.

    Article by Martin Ganchev by Martin Ganchev 5 min read
    How to Create an Inner Join in SQL

    SQL Tutorials

    How to Create an Inner Join in SQL

    Article by Martin Ganchev by Martin Ganchev 11 min read
    Relationships between Tables in SQL

    SQL Tutorials

    Relationships between Tables in SQL

    Article by Martin Ganchev by Martin Ganchev 6 min read

    All Articles

    What are Relational Schemas and What is a Primary Key

    SQL Tutorials

    What are Relational Schemas and What is a Primary Key

    Article by Martin Ganchev by Martin Ganchev 7 min read
    Databases vs Spreadsheets

    SQL Tutorials

    Databases vs Spreadsheets

    Article by Martin Ganchev by Martin Ganchev 13 min read
    SQL is a Declarative Language

    SQL Tutorials

    SQL is a Declarative Language

    Article by Martin Ganchev by Martin Ganchev 5 min read
    Relational Database Essentials

    SQL Tutorials

    Relational Database Essentials

    Article by Martin Ganchev by Martin Ganchev 7 min read
    Introduction to Databases and an Example of a Data Table

    SQL Tutorials

    Introduction to Databases and an Example of a Data Table

    Article by Martin Ganchev by Martin Ganchev 7 min read
    Why You Should Learn SQL

    SQL Tutorials

    Why You Should Learn SQL

    Article by Martin Ganchev by Martin Ganchev 6 min read
    How to Connect SQL and Tableau

    SQL Tutorials

    How to Connect SQL and Tableau

    Article by Martin Ganchev by Martin Ganchev 11 min read
    Installing MySQL and getting acquainted with the interface

    SQL Tutorials

    Installing MySQL and getting acquainted with the interface

    Article by Martin Ganchev by Martin Ganchev 20 min read
    SQL DELETE Statement

    SQL Tutorials

    SQL DELETE Statement

    Article by Martin Ganchev by Martin Ganchev 12 min read
    SQL INSERT Statement

    SQL Tutorials

    SQL INSERT Statement

    Article by Martin Ganchev by Martin Ganchev 14 min read
    SQL UPDATE Statement

    SQL Tutorials

    SQL UPDATE Statement

    Article by Martin Ganchev by Martin Ganchev 12 min read
    SQL Best Practices - How to type code cleanly and perfectly organized

    SQL Tutorials

    SQL Best Practices - How to type code cleanly and perfectly organized

    Article by Martin Ganchev by Martin Ganchev 14 min read

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