How To Write a Query with a Right Outer Join
How To Write a Query with a Right Outer Join? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements
If you want to query from two tables with a right outer join, you can use the RIGHT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a right outer join from two tables: departments and employees. The join condition is that the manager ID in the departments table equals to the employee ID in the employees table:
SQL> set NULL 'NULL' SQL> SELECT d.department_name, e.first_name, e.last_name 2 FROM departments d RIGHT OUTER JOIN employees e 3 ON d.manager_id = e.employee_id; DEPARTMENT_NAME FIRST_NAME LAST_NAME -------------------- -------------------- --------------- Administration Jennifer Whalen Marketing Michael Hartstein Purchasing Den Raphaely Human Resources Susan Mavris Shipping Adam Fripp IT Alexander Hunold ...... NULL Clara Vishney NULL Jason Mallin NULL Hazel Philtanker NULL Nanette Cambrault NULL Alana Walsh NULL Karen Partners NULL Bruce Ernst ......
Note that a right outer join may return extra rows from the second (right) table that do not satisfy the join condition. In those extra rows, columns from the first (left) table will be given null values.
The extra rows returned from the right outer join in this example represents employees that are not assigned as managers in the departments table.
2007-04-19, 6501👍, 0💬
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