Ultimate Guide to Prepare 1Z1-171 with Accurate PDF Questions [Jul 24, 2026]
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NEW QUESTION # 46
Which data dictionary view lists all indexes created by the current user?
- A. USER_INDEXES
- B. ALL_INDEXES
- C. INDEX_LIST
- D. DBA_INDEXES
Answer: A
NEW QUESTION # 47
What is the relationship between SQL and a relational database?
- A. SQL is used to create flat file databases.
- B. SQL is a scripting language used for file manipulation.
- C. SQL is a standard query language used to interact with relational databases
- D. SQL is a file system used to store relational database data.
Answer: C
NEW QUESTION # 48
Which type of join retrieves only the rows with matching values in both tables?
- A. NATURAL JOIN
- B. INNER JOIN
- C. CROSS JOIN
- D. OUTER JOIN
Answer: B
NEW QUESTION # 49
Which command revokes a user's privilege to update a table?
- A. REMOVE UPDATE ON table_name FROM user_name;
- B. DELETE UPDATE ON table_name FROM user_name;
- C. REVOKE UPDATE ON table_name FROM user_name;
- D. DENY UPDATE ON table_name FROM user_name;
Answer: C
NEW QUESTION # 50
What is the purpose of a correlated subquery?
- A. A subquery that can be used only with aggregate functions
- B. A subquery that references columns from the outer query
- C. A subquery that combines data from multiple tables
- D. A subquery that depends on the result of another subquery
Answer: B
NEW QUESTION # 51
What does the following query return?
SELECT ROUND(123.456, 1) AS rounded_value FROM dual;
- A. 123.5
- B. 123.4
- C. 0
- D. 123.45
Answer: A
NEW QUESTION # 52
What does the following command do?
GRANT CREATE SESSION TO user_name;
- A. Grants the user the ability to connect to the database
- B. Allows the user to create new sessions for other users
- C. Assigns the user to a specific role
- D. Allows the user to create database objects
Answer: A
NEW QUESTION # 53
In a relational database, what is a foreign key?
- A. A unique identifier for a record in a table
- B. A key used to sort data in a specific order
- C. A key that is used to establish a relationship between two tables
- D. A temporary key generated during query execution
Answer: C
NEW QUESTION # 54
Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?
- A. CROSS
- B. FULL OUTER JOIN
- C. RIGHT
- D. LEFT
Answer: B
NEW QUESTION # 55
Which of the following is an example of an object privilege?
- A. DROP DATABASE
- B. SELECT ON table_name
- C. CREATE TABLE
- D. ALTER USER
Answer: B
NEW QUESTION # 56
Which INTERVAL data type would you use to store a period of time in years and months?
- A. INTERVAL DAY TO SECOND
- B. INTERVAL MONTH TO DAY
- C. INTERVAL YEAR TO MONTH
- D. INTERVAL MINUTE TO HOUR
Answer: C
NEW QUESTION # 57
What is the default order of evaluation when multiple SET operators are used in a query?
- A. UNION, MINUS, INTERSECT
- B. INTERSECT, UNION, MINUS
- C. UNION, INTERSECT, MINUS
- D. INTERSECT, MINUS, UNION
Answer: B
NEW QUESTION # 58
What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;
- A. NATURAL JOIN
- B. EQUI JOIN
- C. CROSS JOIN
- D. OUTER JOIN
Answer: B
NEW QUESTION # 59
Which SQLPlus command displays defined substitution variable values?
- A. DEFINE
- B. LIST
- C. VERIFY
- D. SHOW
Answer: A
NEW QUESTION # 60
How are NULL values treated in relational databases?
- A. NULL values are treated as zero.
- B. NULL values are not allowed in relational databases.
- C. NULL values represent missing or unknown data.
- D. NULL values are treated as empty strings.
Answer: C
NEW QUESTION # 61
Which of the following statements is true about constraints in Oracle Database?
- A. Constraints can only be added when creating a table.
- B. Constraints are automatically dropped when rows are deleted.
- C. Constraints cannot reference other tables.
- D. Constraints can be added or modified using the ALTER TABLE statement.
Answer: D
NEW QUESTION # 62
Which of the following best describes a relational database?
- A. A database that uses a tabular structure with rows and columns to represent relationships between data entities
- B. A database that organizes data hierarchically
- C. A database where all data is stored as key-value pairs
- D. A flat file system with no defined relationships between data
Answer: A
NEW QUESTION # 63
What is a SELF JOIN in SQL?
- A. A join between tables with identical structures
- B. A join of a table with itself
- C. A join that does not require a WHERE clause
- D. A join used for Cartesian products
Answer: B
NEW QUESTION # 64
Which SQL function calculates the number of months between two dates?
Response:
- A. DATE_CALC
- B. DATE_DIFF
- C. MONTHS_BETWEEN
- D. TIME_DIFF
Answer: C
NEW QUESTION # 65
Which clause in an UPDATE statement typically uses a subquery to assign values to columns?
- A. SET
- B. WHERE
- C. HAVING
- D. FROM
Answer: A
NEW QUESTION # 66
What is the difference between UNION and UNION ALL?
- A. UNION works with subqueries, while UNION ALL does not.
- B. UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
- C. UNION combines columns, while UNION ALL combines rows.
- D. UNION includes all rows, while UNION ALL removes duplicates.
Answer: B
NEW QUESTION # 67
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