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Oracle Database Administration I Sample Questions (Q82-Q87):

NEW QUESTION # 82
Which two are true about a SQL statement using SET operators such as UNION? (Choose two.)

A. The number, but not names, of columns must be identical for all SELECT statements in the query.
B. The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query.
C. The data type group of each column returned by the second query must match the data type group of the corresponding column returned by the first query.
D. The names and number of columns must be identical for all SELECT statements in the query.
E. The data type of each column returned by the second query must exactly match the data type of the corresponding column returned by the first query.

Answer: C,E

NEW QUESTION # 83
Which two statements are true about the ORDER BY clause when used with a SQL statement containing a SET operator such as UNION? (Choose two.)

A. Each SELECT statement in the compound query can have its own ORDER BY clause
B. Only column names from the first SELECT statement in the compound query are recognized
C. Column positions must be used in the ORDER BY clause
D. The first column in the first SELECT of the compound query with the UNION operator is used by default to sort output in the absence of an ORDER BY clause
E. Each SELECT statement in the compound query must have its own ORDER BY clause

Answer: A,B

NEW QUESTION # 84
Examine the description of the EMPLOYEES table:

Which query is valid?

A. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id, join_date;
B. SELECT dept_id, AVG(MAX(salary)) FROM employees GROUP BY dept_id;
C. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id;
D. SELECT dept_id, MAX(AVG(salary)) FROM employees GROUP BY dept_id;

Answer: C

NEW QUESTION # 85
Which two statements are true about views used for viewing tablespace and datafile information? (Choose two.)

A. Tablespace free space can be viewed in DBA_TABLESPACES
B. V$TABLESPACE displays information about tablespaces contained in the data dictionary
C. A datafile can be renamed when the database is in MOUNT state and the new file name is displayed when querying DBA_DATA_FILES after the database is opened
D. Tablespace free space can be viewed in V$TABLESPACE
E. V$TABLESPACE displays information that is contained in the controlfile about tablespaces

Answer: C,E

NEW QUESTION # 86
Which two are true about shrinking a segment online? (Choose two.)

A. It always eliminates all migrated rows if any exist in the table
B. To shrink a table it must have a PRIMARY KEY constraint
C. It is not possible to shrink either indexes or Index Organized Tables (IOTs)
D. To shrink a table it must have a UNIQUE KEY constraint
E. To shrink a table it must have row movement enabled
F. It must be in a tablespace that uses Automatic Segment Space Management (ASSM)

Answer: E,F

Explanation:
Reference:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_3001.htm

NEW QUESTION # 87
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