⟩ How To Write a Left Outer Join with the WHERE Clause in Oracle?
If you don't want to use the LEFT OUTER JOIN ... ON clause to write a left outer join, you can use a special criteria in the WHERE clause as "left_table.column = right_table.column(+)". The select statement below is an example of a left outer join written with the WHERE clause:
SQL> set NULL 'NULL'
SQL> SELECT d.department_name, e.first_name, e.last_name
2 FROM departments d, employees e
3 WHERE 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
......
