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How To Write a Query with a Full Outer Join
How To Write a Query with a Full Outer Join? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements
✍: FYIcenter.com
If you want to query from two tables with a full outer join, you can use the FULL OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a full 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 FULL 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 ...... Treasury NULL NULL Corporate Tax NULL NULL Control And Credit NULL NULL Shareholder Services NULL NULL Benefits NULL NULL Manufacturing NULL NULL Construction NULL NULL ...... 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 two sets of extra rows: one set from the first (left) table that do not satisfy the join condition, and the other set from the second (right) table that do not satisfy the join condition.
2007-04-19, 5022👍, 0💬
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