How To Write a Query with a Right Outer Join?
Page 1 of 1
How To Write a Query with a Right Outer Join?
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
FROM departments d RIGHT OUTER JOIN employees e
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.
... 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
FROM departments d RIGHT OUTER JOIN employees e
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.
Similar topics
» How To Write a Query with a Left Outer Join?
» How To Write a Query with a Full Outer Join?
» How To Write a Left Outer Join with the WHERE Clause?
» How To Write an Inner Join with the WHERE Clause?
» How To Join Two Tables in a Single Query?
» How To Write a Query with a Full Outer Join?
» How To Write a Left Outer Join with the WHERE Clause?
» How To Write an Inner Join with the WHERE Clause?
» How To Join Two Tables in a Single Query?
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
Sun Jan 31, 2010 12:35 am by Micheal
» Accessing tables of other users in SQL
Sun Jan 31, 2010 12:34 am by Micheal
» Grouping commands in SQL
Sun Jan 31, 2010 12:32 am by Micheal
» Operations on Result Sets in SQL
Sun Jan 31, 2010 12:31 am by Micheal
» Subqueries in SQL
Sun Jan 31, 2010 12:30 am by Micheal
» Joining Relations in SQL
Sun Jan 31, 2010 12:28 am by Micheal
» Delete comand in SQL
Sun Jan 31, 2010 12:27 am by Micheal
» Update command in SQL
Sun Jan 31, 2010 12:26 am by Micheal
» Insert command in SQL
Sun Jan 31, 2010 12:23 am by Micheal