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Oracle Database SQL Sample Questions (Q44-Q49):

NEW QUESTION # 44
Which statement is true regarding the INTERSECT operator?

A. The number of columns and data types must be identical for all SELECT statements in the query
B. The names of columns in all SELECT statements must be identical
C. Reversing the order of the intersected tables the result
D. It ignores NULL values

Answer: A

Explanation:
INTERSECT Returns only the rows that occur in both queries' result sets, sorting them and
removing duplicates.
The columns in the queries that make up a compound query can have different names, but
the output result set will use the names of the columns in the first query.

NEW QUESTION # 45
Which three privileges can be restricted to a subset of columns in a table? (Choose three.)

A. DELETE
B. INSERT
C. UPDATE
D. SELECT
E. ALTER
F. REFERENCES
G. INDEX

Answer: A,C,D

Explanation:
Explanation

NEW QUESTION # 46
Which two are true about virtual columns?

A. They can be referenced in the set clause of an update statement as the name of the column To be updated.
B. They can be referenced in the column expression of another virtxial column.
C. They cannot have a data type explicitly specified.
D. They can be indexed.
E. They can be referenced In the where clause of an update or debete statement.

Answer: C,D

Explanation:
Regarding the properties and capabilities of virtual columns in Oracle Database:
* C. They can be indexed: In Oracle, virtual columns can indeed be indexed. This allows for performance optimization on queries that utilize these columns, despite the fact that their values are derived and not stored physically.
* D. They cannot have a data type explicitly specified: The data type of a virtual column is derived from the expression used to define it. Therefore, it is not specified explicitly but is inferred from the expression itself.
Incorrect options:
* A: Virtual columns cannot be referenced in the WHERE clause of UPDATE or DELETE statements because they are not stored and cannot be individually modified.
* B: Virtual columns cannot be referenced in the SET clause of an UPDATE statement since they are derived from other column values and cannot be updated directly.
* E: Virtual columns cannot reference other virtual columns in their expressions due to the potential for recursive and complex dependencies.

NEW QUESTION # 47
Which two statements are true about sequences created in a single instance Oracle database? (Choose two.)

A. When the MAXVALUElimit for a sequence is reached, it can be increased by using the ALTER SEQUENCEstatement.
B. When a database instance shuts down abnormally, sequence numbers that have been cached but not used are available again when the instance is restarted.
C. DELETE <sequencename>would remove a sequence from the database.
D. CURRVALis used to refer to the most recent sequence number that has been generated for a particular sequence.
E. The numbers generated by an explicitly defined sequence can only be used to insert data in one table.

Answer: A,D

Explanation:
Explanation/Reference:
References:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm

NEW QUESTION # 48
Examine the description of the CUSTOMERStable:

CUSTNOis the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result? (Choose two.)

A. FULL OUTER JOINwith self join
B. LEFT OUTER JOINwith self join
C. self join
D. subquery
E. RIGHT OUTER JOINwith self join

Answer: C,D

NEW QUESTION # 49
......

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