SQL Joins
SQL Joins are a fundamental database operation 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 customers to their orders or employees to their departments. Common join types include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN, each serving different data retrieval needs.
Developers should learn SQL Joins when working with relational databases like MySQL, PostgreSQL, or SQL Server to perform complex queries that involve multiple tables. They are essential for data analysis, reporting, and application development where data is normalized across tables, such as in e-commerce systems or enterprise software. Mastering joins helps optimize queries and ensure accurate data relationships.