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Oracle Database SQL Sample Questions (Q115-Q120):

NEW QUESTION # 115
Examine this SQL statement:

Which two are true? (Choose two.)

A. The subquery is executed for every updated row in the ORDERStable
B. The subquery is not a correlated subquery
C. The UPDATEstatement executes successfully even if the subquery selects multiple rows
D. The subquery is executed before the UPDATEstatement is executed
E. All existing rows in the ORDERStable are updated

Answer: D,E

NEW QUESTION # 116
Which two statements are true regarding constraints? (Choose two.)

A. A constraint can be disabled even if the constraint column contains data.
B. A constraint is enforced only for the INSERT operation on a table.
C. All the constraints can be defined at the column level as well as the table level
D. A foreign key cannot contain NULL values.
E. A column with the UNIQUE constraint can contain NULL.

Answer: A,E

NEW QUESTION # 117
Evaluate the following SQL statement:
SQL> select cust_id, cust_last_name "Last name"
FROM customers
WHERE country_id = 10
UNION
SELECT cust_id CUST_NO, cust_last_name
FROM customers
WHERE country_id = 30
Identify three ORDER BY clauses either one of which can complete the query. (Choose three.)

A. ORDER BY 2, cust_id
B. ORDER BY "Last name"
C. ORDER BY CUST_NO
D. ORDER BY "CUST_NO"
E. ORDER BY 2,1

Answer: A,B,E

Explanation:
Using the ORDER BY Clause in Set Operations
-The ORDER BY clause can appear only once at the end of the compound query.
-Component queries cannot have individual ORDER BY clauses.
-The ORDER BY clause recognizes only the columns of the first SELECT query.
-By default, the first column of the first SELECT query is used to sort the output in an ascending order.

NEW QUESTION # 118
Examine the structure of the CUSTOMERS table: (Choose two.)

CUSTNO is 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?

A. Subquery
B. Self-join
C. Full outer-join with self-join
D. Right outer-join with self-join
E. Left outer-join with self-join

Answer: A,B

NEW QUESTION # 119
Which three statements are true about Structured Query Language (SQL)?

A. It is used to define encapsulation and polymorphism for a relational table.
B. It requires that data be contained in hierarchical data storage.
C. It is the only language that can be used for both relational and object-oriented databases.
D. It guarantees atomicity, consistency, isolation, and durability (ACID) features.
E. It best supports relational databases.
F. It provides independence for logical data structures being manipulated from the underlying physical data storage

Answer: B,D,F

NEW QUESTION # 120
......

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