Reliable Oracle Database 1Z0-171 Dumps PDF Aug 26, 2026 Recently Updated Questions
Pass Your Oracle 1Z0-171 Exam with Correct 111 Questions and Answers
NEW QUESTION # 20
Which of the following is true about foreign key constraints in SQL?
- A. They define a relationship between two tables.
- B. They enforce the uniqueness of values in a column.
- C. They ensure that a column only contains NULL values.
Answer: A
NEW QUESTION # 21
Which of the following data dictionary views provides information about constraints on tables?
- A. DBA_CONSTRAINTS
- B. USER_CONSTRAINTS
- C. ALL_CONSTRAINTS
- D. All of the above
Answer: D
NEW QUESTION # 22
Which type of privilege allows a user to perform administrative tasks, such as creating other users?
- A. Table privilege
- B. Schema privilege
- C. Object privilege
- D. System privilege
Answer: D
NEW QUESTION # 23
What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;
- A. Combines the salaries and bonuses for employees, removing duplicates
- B. Combines all employee IDs, salaries, and bonuses, including duplicates
- C. Returns only employees with duplicate employee IDs in both tables
- D. Returns only the employees with salaries and bonuses
Answer: B
NEW QUESTION # 24
How does SQL handle NULL values in arithmetic expressions?
- A. Treats them as zero
- B. Treats them as the largest possible number
- C. Produces a NULL result
- D. Produces an error
Answer: C
NEW QUESTION # 25
Which clause is used to ensure that only specific rows are deleted in a DELETE statement?
- A. SET
- B. WHERE
- C. FROM
- D. HAVING
Answer: B
NEW QUESTION # 26
Which SQL function calculates the number of months between two dates?
Response:
- A. MONTHS_BETWEEN
- B. DATE_DIFF
- C. TIME_DIFF
- D. DATE_CALC
Answer: A
NEW QUESTION # 27
What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;
- A. Retrieves employees with salary less than 5000, sorted by department ID
- B. Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order
- C. Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order
- D. Retrieves all employees, sorted by department ID
Answer: B
NEW QUESTION # 28
What does the NEXTVAL pseudocolumn do in SQL?
- A. Retrieves the next value in a sequence and increments the sequence
- B. Retrieves the current value of a sequence without incrementing it
- C. Resets the sequence to its starting value
- D. Deletes the sequence from the database
Answer: A
NEW QUESTION # 29
Which clause in an UPDATE statement typically uses a subquery to assign values to columns?
- A. SET
- B. FROM
- C. HAVING
- D. WHERE
Answer: A
NEW QUESTION # 30
What is the purpose of the DBA_OBJECTS data dictionary view?
- A. To provide information about all objects in the database
- B. To show the current session details
- C. To list all users in the database
- D. To monitor system performance
Answer: A
NEW QUESTION # 31
Which SQL keyword is used to define a substitution variable in a SQL statement?
- A. VAR
- B. SUBSTITUTION
- C. SET
- D. DEFINE
Answer: D
NEW QUESTION # 32
Which data dictionary view lists all indexes created by the current user?
- A. USER_INDEXES
- B. ALL_INDEXES
- C. DBA_INDEXES
- D. INDEX_LIST
Answer: A
NEW QUESTION # 33
What will the following SQL query do?
UPDATE employees
SET salary = salary * 1.1
WHERE department_id = 10;
- A. Set the salary to 1.1 for employees in department 10
- B. Increase the salary of employees in department 10 by 10%
- C. Decrease the salary of employees in department 10 by 10%
- D. Increase the salary of all employees by 10%
Answer: B
NEW QUESTION # 34
Which SQLPlus command displays defined substitution variable values?
- A. LIST
- B. SHOW
- C. DEFINE
- D. VERIFY
Answer: C
NEW QUESTION # 35
Which SQL function converts a string representation of a date into a date data type?
- A. DATE_CONVERT
- B. CONVERT_TO_DATE
- C. CAST_TO_DATE
- D. TO_DATE
Answer: D
NEW QUESTION # 36
What does the following command do?
GRANT CREATE SESSION TO user_name;
- A. Grants the user the ability to connect to the database
- B. Assigns the user to a specific role
- C. Allows the user to create new sessions for other users
- D. Allows the user to create database objects
Answer: A
NEW QUESTION # 37
Which clause can be used with SET operators to sort the final result set?
- A. ORDER BY
- B. GROUP BY
- C. HAVING
- D. WHERE
Answer: A
NEW QUESTION # 38
Which of the following statements is true about constraints in Oracle Database?
- A. Constraints can be added or modified using the ALTER TABLE statement.
- B. Constraints can only be added when creating a table.
- C. Constraints are automatically dropped when rows are deleted.
- D. Constraints cannot reference other tables.
Answer: A
NEW QUESTION # 39
What does the EXISTS operator check in a subquery?
- A. If the subquery references the outer query
- B. If the subquery contains only unique values
- C. If the subquery returns any rows
- D. If the subquery returns a specific number of rows
Answer: C
NEW QUESTION # 40
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