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Possible Duplicate:
Oracle "(+)" Operator
Can some one tell me what does (+) sign do in sql.. Thanks
a.sample_nbr = b.sample_nbr (+) and
a.sample_nbr = b.sub_sample_nbr (+) and
outer join – wikipedia is sometimes reliable.
The (+) after b.sample_nbr makes the "b" table optional. The query returns all tables, and where there are no corresponding constraint records, Oracle supplies a null in the constraint name column.