SQL Joins
SQL FULL JOIN
Full Outer Join in SQL
FULL OUTER JOIN combines all rows from both tables, handling NULLs for non-matches.
Understanding SQL FULL JOIN
The SQL FULL JOIN, also known as FULL OUTER JOIN, is a type of join used to retrieve all records from both tables involved in the join. When there is no match between the columns, the result is filled with NULL values. This type of join is beneficial for finding matches between tables or returning complete datasets when some rows do not have corresponding matches in the other table.
Syntax of SQL FULL JOIN
The syntax for a SQL FULL JOIN is straightforward. Here is the basic structure:
Example of SQL FULL JOIN
Let's consider two tables, Customers and Orders. We want to find all customers and orders, including customers who have not placed any orders and orders that are not associated with any customer:
The result of the above query will include all customers and all orders, with NULL values where there is no match:
When to Use SQL FULL JOIN
Use SQL FULL JOIN when you need to combine rows from two tables and want to retain all entries from both tables, regardless of whether there is a match. This is especially useful in data analysis tasks where the presence of unmatched data is important for decision-making processes.
SQL Joins
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- FULL JOIN
- CROSS JOIN
- Self Join
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- RIGHT JOIN
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- CROSS JOIN
