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Oracle Database SQL Sample Questions (Q115-Q120):

NEW QUESTION # 115
Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true? (Choose two.)

A. Unique key constraints defined on the COUNTRY column are removed.
B. Indexes created on the COUNTRY column exist until the DROP UNUSED COLUMNS command is executed.
C. A new column, COUNTRY, can be added to the DEPARTMENTS table after executing the command.
D. Synonyms existing of the DEPARTMENTS table would have to be re-created.
E. Views created in the DEPARTMENTS table that include the COUNTRY column are automatically modified and remain valid.

Answer: A,C

NEW QUESTION # 116
Which three statements are true about inner and outer joins?

A. A full outer join must use Oracle syntax.
B. A left or right outer join returns only unmatched rows.
C. Outer joins can be used when there are multiple join conditions on two tables.
D. Outer joins can only be used between two tables per query.
E. A full outer join returns matched and unmatched rows.
F. An inner join returns matched rows.

Answer: C,E,F

NEW QUESTION # 117
Examine the command to create the BOOKS table.

The BOOK_ID value 101 does not exist in the table.
Examine the SQL statement:

Which statement is true?

A. It executes successfully only if the PUBLISHER_ID column name is added to the columns list and NULL is explicitly specified in the INSERT statement.
B. It executes successfully only if the PUBLISHER_ID column name is added to the columns list in the INSERT statement.
C. It executes successfully only if NULL is explicitly specified in the INSERT statement.
D. It executes successfully and the row is inserted with a rule PUBLISHER_ID.

Answer: D

NEW QUESTION # 118
Which three statements are true about the Oracle join and ANSI Join syntax?

A. The Oracle join syntax only supports right outer joins,
B. The Oracle join syntax supports creation of a Cartesian product of two tables.
C. The Oracle join syntax performs better than the SQL:1999 compliant ANSI join syntax.
D. The SQL:1999 compliant ANSI join syntax supports natural joins.
E. The SQL:1999 compliant ANSI join syntax supports creation of a Cartesian product of two tables.
F. The Oracle join syntax performs less well than the SQL:1999 compliant ANSI Join Answer.
G. The Oracle join syntax supports natural joins.

Answer: B,D,E

Explanation:
Regarding Oracle join and ANSI join syntax:
* B. The Oracle join syntax supports the creation of a Cartesian product of two tables. This is true.
In Oracle, if you list tables in the FROM clause without a join condition, it creates a Cartesian product.
* C. The SQL:1999 compliant ANSI join syntax supports natural joins. This is true. ANSI syntax supports natural joins, which join tables based on columns with the same names in the joined tables.
* F. The SQL:1999 compliant ANSI join syntax supports the creation of a Cartesian product of two tables. This is true. The ANSI standard allows for Cartesian products when tables are listed in the FROM clause without a join condition.
Options A, D, E, and G are incorrect:
* A is incorrect because the Oracle join syntax supports all types of joins, including right outer joins.
* D is incorrect because Oracle's proprietary join syntax does not use the term "natural join."
* E is incorrect because there is no inherent performance difference between Oracle join syntax and ANSI join syntax; performance depends on how the query is written and how the database optimizer handles it.
* G is incorrect for the same reason as E.

NEW QUESTION # 119
On your Oracle 12c database, you invoked SQL *Loader to load data into the EMPLOYEEStable in the HR schema by issuing the following command:
$> sqlldr hr/hr@pdb table=employees
Which two statements are true regarding the command? (Choose two.)

A. It fails because no SQL *Loader data file location is specified.
B. It fails if the HR user does not have the CREATE ANY DIRECTORYprivilege.
C. It succeeds with default settings if the EMPLOYEEStable belonging to HR is already defined in the database.
D. It fails because no SQL *Loader control file location is specified.

Answer: B,C

Explanation:
Explanation/Reference:

NEW QUESTION # 120
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