Different Joins In SQL

Joins are fundamental to relational database management systems. They allow you to combine data from multiple tables based on a shared column. Imagine you have a table of customers and a table of orders. A join lets you see which customer placed which order. There are several types of joins, each with a specific purpose.The **INNER JOIN** returns only the rows where the join condition is met in both tables. It's the most common type, effectively filtering out rows that don't have a match in the other table. The **LEFT JOIN** returns all rows from the left table (the table specified before the JOIN keyword), even if there's no match in the right table. Missing values from the right table are filled with NULLs. This is useful for finding all customers and their associated orders, even if some customers haven't placed any orders.The **RIGHT JOIN** is the opposite of the LEFT JOIN. It returns all rows from the right table, and NULLs for missing values in the left table.The **FULL OUTER JOIN** returns all rows from both tables. If there's no match in one table, the corresponding columns from the other table will have NULL values. This is less common than the other join types, but useful for situations where you need all data from both tables, regardless of whether there's a match in the other table.Understanding the nuances of each join type is critical for constructing accurate and efficient queries.