Using an outer join produces this information: rows that do not have matching values in common columns are not included in the result table.
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Q51: Joining tables or using a subquery may
Q52: IF-THEN-ELSE logical processing cannot be accomplished within
Q53: One major disadvantage of the outer join
Q54: An equi-join is a join in which
Q55: The UNION clause is used to combine
Q57: It is better not to have a
Q58: The natural join is very rarely used.
Q59: Combining a table with itself results in
Q60: The joining condition of an equi-join is
Q61: Correlated subqueries are less efficient than queries
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