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Oracle Database SQL Sample Questions (Q240-Q245):

NEW QUESTION # 240
Which four statements are true about constraints on Oracle tables?

A. A Column can have only one CHECK Constraint.
B. A NOT NULL Constraint can be defined at the table level.
C. A FOREIGN KEY Column can contain NULLS.
D. A UNIQUE Constraint can use a pre-existing index on the constrained column or columns.
E. A CHECK Constraint can refer to values in other rows.
F. A PRIMARY KEY Constraint can be added after a table has been created and populated.
G. A UNIQUE constraint permits NULLS.

Answer: C,D,F,G

Explanation:
C: True. A UNIQUE constraint in Oracle SQL allows for the inclusion of NULL values; specifically, it permits multiple NULLs in a column or set of columns but ensures that all non-NULL values are unique.
D: True. A PRIMARY KEY constraint can indeed be added to a table after it has been created and even after it has been populated, as long as the existing data does not violate the primary key constraint rules (i.e., all values must be unique and not NULL).
F: True. A UNIQUE constraint can utilize a pre-existing index on the columns it covers. If a suitable index already exists, Oracle can use this index to enforce the constraint, optimizing performance and resource utilization.
G: True. Columns that are part of a FOREIGN KEY constraint can contain NULL values. This is permissible under SQL standards and Oracle implementation, as a NULL foreign key value is considered to not refer to any row in the referenced table and thus does not violate referential integrity.

NEW QUESTION # 241
Which statement is true regarding the INTERSECT operator?

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

Answer: C

Explanation:
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 # 242
Which two statements are true about a self join?

A. It can be a left outer join.
B. It can be an inner join.
C. It must be a full outer join.
D. It must be an equijoin.
E. The join key column must have an index.

Answer: B,E

Explanation:
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-self-join/

NEW QUESTION # 243
View the Exhibit and examine the description of the EMPLOYEES table.

Evaluate the following SQL statement:
SELECT first_name, employee_id, NEXT_DAY(ADD_MONTHS(hire_date, 6), 1) "Review" FROM employees; The query was written to retrieve the FIRST_NAME, EMPLOYEE_ID, and review date for employees. The review date is the firsts Monday after the completion of six months of the hiring. The NLS_TERRITORY parameter is set to AMERICA in the session.
Which statement is true regarding this query?

A. The query would not execute because the NEXT_DAY function accepts a string as argument.
B. The query would execute but the output would give review dates that are Sundays.
C. The query would not execute because date functions cannot be nested.
D. The query would execute to give the desired output.

Answer: B

NEW QUESTION # 244
View the Exhibit and examine the structure of the ORDERS table.

You must select ORDER_ID and ORDER_DATE for all orders that were placed after the last order placed by CUSTOMER_ID 101.
Which query would give you the desired result?

A. SELECT order_id, order_date FROM orders
WHERE order_date > ALL
(SELECT order_date FROM orders WHERE customer_id = 101);
B. SELECT order_id, order_date FROM orders
WHERE order_date > IN
(SELECT order_date FROM orders WHERE customer_id = 101);
C. SELECT order_id, order_date FROM orders
WHERE order_date > ALL
(SELECT MAX(order_date) FROM orders ) AND customer_id = 101;
D. SELECT order_id, order_date FROM orders
WHERE order_date >
ANY
(SELECT order_date FROM orders WHERE customer_id = 101);

Answer: A

NEW QUESTION # 245
......

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