Can you tell me the types of joins in SQL?

SQL supports several join types that combine rows from two or more tables based on a related column. The most common are:

• INNER JOIN: returns rows where the join condition is true in both tables.
• LEFT (OUTER) JOIN: returns all rows from the left table and matching rows from the right; unmatched right rows are NULL.
• RIGHT (OUTER) JOIN: symmetric to LEFT JOIN, returning all rows from the right table.
• FULL (OUTER) JOIN: returns rows when there is a match in either table, filling missing side with NULL.
• CROSS JOIN: returns the Cartesian product of the two tables.
• SELF JOIN: a table joined to itself, useful for hierarchical data.

Additionally, SQL:2003 introduced NATURAL JOIN (joins on columns with the same name) and USING clause for specifying join columns. Understanding these joins is essential for accurate data retrieval and performance tuning.