Oracle 1Z0-171 Certification Sample Questions and Answers

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Oracle 1Z0-171 Sample Questions:

01. What is the primary purpose of a primary key in a relational database?
a) To store duplicate data in a table
b) To uniquely identify each record in a table
c) To establish relationships between tables
d) To sort data in ascending order
 
02. How is the LOCALTIMESTAMP function different from CURRENT_TIMESTAMP?
a) LOCALTIMESTAMP does not include fractional seconds, while CURRENT_TIMESTAMP does.
b) LOCALTIMESTAMP uses the database time zone, while CURRENT_TIMESTAMP uses the session time zone.
c) LOCALTIMESTAMP returns only the date, while CURRENT_TIMESTAMP returns the date and time.
d) Both functions are identical in output.
 
03. Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?
a) Rectangles
b) Diamonds
c) Ovals
d) Arrows
 
04. What does the EXISTS operator check in a subquery?
a) If the subquery returns any rows
b) If the subquery contains only unique values
c) If the subquery returns a specific number of rows
d) If the subquery references the outer query
 
05. What happens if a privilege is revoked from a user who has granted the same privilege to others?
a) The privilege is retained by the other users.
b) The privilege is revoked from all other users.
c) The privilege is transferred to another user.
d) The privilege cannot be revoked in this scenario.
 
06. Which of the following SET operators combines results from two queries and removes duplicates?
a) UNION
b) UNION ALL
c) INTERSECT
d) MINUS
 
07. Which clause in a SQL SELECT statement is used to define the columns to be retrieved?
a) WHERE
b) FROM
c) SELECT
d) GROUP BY
 
08. How does SQL handle NULL values in arithmetic expressions?
a) Treats them as zero
b) Produces an error
c) Treats them as the largest possible number
d) Produces a NULL result
 
09. Which command is used to add a new column to an existing table?
a) ALTER COLUMN
b) ADD COLUMN
c) ALTER TABLE
d) MODIFY COLUMN
 
10. Which type of privilege allows a user to perform administrative tasks, such as creating other users?
a) Object privilege
b) Schema privilege
c) Table privilege
d) System privilege

Answers:

Question: 01

Answer: b

Question: 02

Answer: a

Question: 03

Answer: c

Question: 04

Answer: a

Question: 05

Answer: b

Question: 06

Answer: a

Question: 07

Answer: c

Question: 08

Answer: d

Question: 09

Answer: c 

Question: 10

Answer: d

 

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