Sql Programming Tutorials, Guides & Best Practices

Use the following command to import a database from a SQL file:

mysql -u your_username -p your_database_name < backup.sql

SELECT name FROM employees ORDER BY salary DESC LIMIT 10;

• Query Caching: Enable if supported by your DBMS.

SELECT name FROM employees_us
UNION ALL
SELECT name FROM employees_uk;

Window functions calculate values across a set of rows related to the current row without collapsing rows into groups.

SQL (Structured Query Language) is a powerful tool used to interact with relational databases. One of its most useful features is the ability to combine data from multiple tables using joins. Joins are essential in querying related data stored in different tables, enabling users to analyze and generate comprehensive reports.

In this tutorial, we will explore various types of SQL joins, understand their syntax, and learn through examples. By the end of this guide, you will have a solid understanding of how to use joins to fetch related data across tables efficiently.