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LEFT OUTER JOINA LEFT OUTER JOIN is one of the JOIN operations that allow you to specify a join clause. It preserves the unmatched rows from the first (left) table, joining them with a NULL row in the shape of the second (right) table. Syntax
The scope of expressions in either the ON or the USING clause includes the current tables and any tables in query blocks outer to the current SELECT. The ON clause can reference tables not being joined and does not have to reference either of the tables being joined (though typically it does). For additional differences between ON and USING clauses, see ResultSet and Performance Differences Between ON and USING. Examples
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