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Oracle Database SQL Sample Questions (Q193-Q198):

NEW QUESTION # 193
Evaluate the following SELECTstatement and view the exhibit to examine its output:
SELECT constraint_name, constraint_type, search_condition, r_constraint_name, delete_rule, status, FROM user_constraints WHERE table_name = 'ORDERS';

Which two statements are true about the output? (Choose two.)

A. The R_CONSTRAINT_NAMEcolumn gives the alternative name for the constraint.
B. In the second column, 'c'indicates a check constraint.
C. The column DELETE_RULEdecides the state of the related rows in the child table when the corresponding row is deleted from the parent table.
D. The STATUScolumn indicates whether the table is currently in use.

Answer: B,C

NEW QUESTION # 194
View the Exhibits and examine the structure of the COSTS and PROMOTIONS tables.
You want to display PROD IDS whose promotion cost is less than the highest cost PROD ID in a pro motion time interval.
Examine this SQL statement:
SELECT prod id
FROM costs
WHERE promo id IN
(SELECT promo id
FROM promotions
WHERE promo_cost < ALL
(SELECT MAX (promo cost)
FROM promotions
GROUP BY (promo_end date-promo_begin_date)) );
What will be the result?

A. It executes successfully and gives the required result.
B. It gives an error because the GROUP BY clause is not valid
C. It gives an error because the ALL keyword is not valid.
D. It executes successfully but does not give the required result.

Answer: D

NEW QUESTION # 195
Which two statements are true about an Oracle database?

A. A table can have multiple foreign keys.
B. A VARCHAR2 column without data has a NULL value.
C. A NUMBER column without data has a zero value.
D. A table can have multiple primary keys.
E. A column definition can specify multiple data types.

Answer: A,B

NEW QUESTION # 196
Examine these statements and results
SQL> SELECT COUNT(*) FROM emp
COUNT(*)
---------------------
14
sQL> CREATE GLOBAL TEMPORARY TABLE t emp As SELECT * FROM emp;
Table created
SQL> INSERT INTo temp SELECT * FROM emp;
14 rows created
SQL> COMMIT:
Commit complete*
SQL> INSERT INTo temp SELECT * EROM emp;
14. rows created
SQL> SELECT COUNT(*) FROM t emp
How many rows are retrieved by the last query?

A. 0
B. 1
C. 2
D. 3

Answer: A

Explanation:
Global temporary tables in Oracle Database are designed to hold temporary data for the duration of a session or a transaction.
Given that the global temporary table is created and then populated twice from the emp table without any mention of data deletion, one would initially think the count would be 28, since 14 rows are inserted twice.
However, if the temporary table was created with the default ON COMMIT DELETE ROWS option, the rows are deleted at the end of the transaction, which is signified by the COMMIT operation.
Thus, after the first COMMIT, the temporary table would be empty. After the second INSERT, another 14 rows would be added. So, the last query would retrieve 14 rows unless a DELETE operation was committed.

NEW QUESTION # 197
Examine this query which executes successfully:
SELECT job, deptno FROM emp
UNION ALL
SELECT job, deptno FROM jobs_ history;
What will be the result?

A. It will return rows common to both SELECT statements.
B. It will return rows that are not common to both SELECT statements.
C. It will return rows from both SELECT statements after eliminating duplicate rows.
D. It will return rows from both SELECT statements including duplicate rows.

Answer: D

Explanation:
The UNION ALL operator in SQL is used to combine the results of two or more SELECT statements:
* Option D: It will return rows from both SELECT statements including duplicate rows.
* UNION ALL does not eliminate duplicates; it simply combines all rows from the queries provided.
Options A, B, and C are incorrect as they describe behaviors of other set operators:
* Option A: Describes the behavior of INTERSECT, not UNION ALL.
* Option B: Describes the behavior of UNION, not UNION ALL.
* Option C: Describes the behavior of EXCEPT or MINUS, not UNION ALL.

NEW QUESTION # 198
......

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