👉 The JOINS FLUID, often referred to as the "join engine," is a component within SQL databases that manages how tables are joined during query execution. It determines the underlying algorithm and optimization techniques used to combine rows from two or more tables based on a related column between them. Different databases support various join engines (e.g., Hash Join, Merge Join, Nested Loop Join), each with its own efficiency characteristics depending on the data size and structure. The choice of join engine can significantly impact query performance, making it a crucial aspect of database design and optimization.
