A right outer join returns all the values from the right table and matched values from the left table ( NULL in the case of no matching join predicate ).
12.
Chamberlin also argued that besides providing some missing-value functionality, practical experience with Nulls also led to other language features which rely on Nulls, like certain grouping constructs and outer joins.
13.
If NULL join columns are to be deliberately removed from the result set, an inner join can be faster than an outer join because the table join and filtering is done in a single step.
14.
These names derive from the appearance of the query plan if drawn as a tree, with the outer join relation on the left and the inner relation on the right ( as convention dictates ).
15.
Since each email address can be the ID of a record in separate file ( in SQL terms, an outer join; in U2 terms, a " translate " ), this provides the reason why U2 may be classified as a MultiValued database.
16.
If you want to return records where there is only a result in one of the tables ( for example a document with no matching author record ) you will want to use outer joins instead of inner joins . BradV 16 : 14, 20 February 2008 ( UTC)
17.
The result of the right outer join is the set of all combinations of tuples in " R " and " S " that are equal on their common attribute names, in addition to tuples in " S " that have no matching tuples in " R ".
18.
The result of the left outer join is the set of all combinations of tuples in " R " and " S " that are equal on their common attribute names, in addition ( loosely speaking ) to tuples in " R " that have no matching tuples in " S ".
19.
Then " select fruit, nvl ( cnt, 0 ) cnt from fruits left outer join ( select fruit, count ( * ) cnt from favorites ) . . . " Then, strawberry will have a null value for cnt, you null-value it to zero . talk ) 12 : 37, 2 May 2016 ( UTC)
20.
The result of the full outer join is the set of all combinations of tuples in " R " and " S " that are equal on their common attribute names, in addition to tuples in " S " that have no matching tuples in " R " and tuples in " R " that have no matching tuples in " S " in their common attribute names.
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