The result of           unknown is unknown.

Related MCQs

• The predicate in a where clause can involve Boolean operations such as and. The result of true and unknown is               false and unknown is            while unknown and unknown is            
• A            indicates an absent value that may exist but be unknown or that may not exist at all.
• The result which operation contains all pairs of tuples from the two relations, regardless of whether their attribute values match.
• The                operator takes the results of two queries and returns only rows that appear in both result sets.
• The              clause allows us to select only those rows in the result relation of the           clause that satisfy a specified predicate.
• The                  clause is used to list the attributes desired in the result of a query.
•            clause is an additional filter that is applied to the result.
• Which join refers to join records from the write table that have no matching key in the left table are include in the result set:
• The iterator maintains the                      of its execution in between calls so that successive next() requests receive successive result tuples.
• Cursor that reflects the changes made to the database table even after the result set is returned