Outer Joins

An outer join is created when records needs to be included in the results without having a corresponding records in the join tables. These records are matched with the NULL records so that they are included in the output

An outer join can be created by using the WHERE clause with an outer join operator or the OUTER JOIN keywords

• The outer join operator can be used for only one table in the joining condition.In other words, you can’t create NULL rows in both tables at the same time.
• A condition that includes the outer join operator can’t use the IN or ORoperator.

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