SQL Joins
SQL Joins are a fundamental concept in SQL (Structured Query Language) used to combine rows from two or more tables based on a related column between them. They enable querying and retrieving data from multiple tables in a relational database, such as linking customer information with their orders. Common types include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN, each defining how unmatched rows are handled.
Developers should learn SQL Joins when working with relational databases like MySQL, PostgreSQL, or SQL Server to perform complex queries that involve multiple tables, such as generating reports, analyzing relationships, or building data-driven applications. They are essential for data integration, ensuring data consistency, and optimizing queries in scenarios like e-commerce platforms where user and order data need to be linked.