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Left outer join or Right outer join on Oracle
Joined: Mar 04, 2008
Jul 22, 2012 12:25:52
I have two tables: employee and department. The employee table has a foreign key dep_id pointing to the primary key, dep_id, of the department table.
Outer Left Join: SELECT d.name, e.name FROM department d, employee e WHERE
d.dep_id = e.dep_id (+);
Do I get a Outer Right Join by just switching the sides on equal sign (=) like following?
SELECT d.name, e.name FROM department d, employee e WHERE
e.dep_id (+) = d.dep_id;
They are both valid SQL statements. I guess the result set should be the same. Correct?
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Joined: Aug 22, 2010
Jul 23, 2012 03:02:32
Yes, the two statements are identical.
Similarly with the ANSI syntax, a left join can always be expressed as a right join (and vice versa), simply by reversing the order of the tables.
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