Most Recent Oracle 1Z0-071 Exam Dumps

Prepare for the Oracle Database SQL exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

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The questions for 1Z0-071 were last updated on Feb 19, 2025.

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Question No. 1

Examine the description of the BOOKS table:

The table has 100 rows.

Examine this sequence of statements issued in a new session;

INSERT INTO BOOKS VALUES ('ADV112' , 'Adventures of Tom Sawyer', NULL, NULL);

SAVEPOINT a;

DELETE from books;

ROLLBACK TO SAVEPOINT a;

ROLLBACK;

Which two statements are true?

AThe first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed.

BThe second ROLLBACK command does nothing.

CThe first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row.

DThe second ROLLBACK command replays the delete.

EThe second ROLLBACK command undoes the insert.

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Correct Answer: B, E

B: True. The second ROLLBACK command would not do anything because the first ROLLBACK TO SAVEPOINT a; already undid the delete operation, and there was no other DML operation between the first and the second ROLLBACK.

E: True. The second ROLLBACK command undoes the insert because after the first ROLLBACK TO SAVEPOINT a; there are no savepoints defined, so a subsequent ROLLBACK would undo all transactions to the beginning of the current session or last COMMIT.

The ROLLBACK command is used to undo transactions that have not yet been committed. Rolling back to a savepoint only undoes transactions up to that savepoint, and a subsequent ROLLBACK without a savepoint name will undo all uncommitted changes since the last COMMIT.

Reference: Oracle SQL documentation on the ROLLBACK statement provides details on how it interacts with savepoints and the effects it has on the transactions within a session.

Question No. 2

Which three statements are true about a self join?

AIt must be an inner join.

BIt must be an equijoin.

CThe query must use two different aliases for the table.

DThe on clause can be used.

EThe on clause must be used.

FIt can be an outer join.

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Correct Answer: C, D, F

C . True, when performing a self join, aliases are used to differentiate the same table in different contexts within the same query. This helps in comparing different rows within the same table as if they were in two separate tables. D . True, the ON clause can be used in self joins to specify the conditions on which the join is based. This is a standard method for specifying join conditions in SQL. F . True, a self join can be an outer join, allowing for the inclusion of rows that do not have a matching row in the same table according to the join condition. This enhances the flexibility of data analysis and reporting.

Oracle documentation on joins: Oracle Database SQL Language Reference

Details on self joins and outer joins: Oracle Joins Tutorial

Question No. 3

The ORDERS table has a column ORDER_DATE of date type DATE The default display format for a date is DD-MON-RR

Which two WHERE conditions demonstrate the correct usage of conversion functions?

AWHERE ordet_date> TO_CHAR(ADD_MONTHS(SYSDATE, 6),'MON DD YYYY')

BWHERE TO_CHAR(order_date,'MON DD YYYY') ='JAN 20 2019';

CWHERE order_date> TO_DATE('JUL 10 2018','MON DD YYYY');

DWHERE order_date IN (TO_DATE ('Oct 21 2018','MON DD YYYY'), TO_CHAR('Nov 21 2018','MON DD YYYY'));

EWHERE order_date> TO_DATE(ADD_MONTHS(SYSDATE,6),'MON DD YYYY');

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Correct Answer: C

In SQL, the correct usage of conversion functions is crucial when performing operations on dates. Oracle uses the TO_DATE function to convert a string to a date, and the TO_CHAR function to convert dates or numbers to strings.

Statement C is correct: WHERE order_date > TO_DATE('JUL 10 2018','MON DD YYYY'); is a proper use of the TO_DATE function. It converts the string 'JUL 10 2018' to a date type, with the format 'MON DD YYYY', which is then used to compare with the order_date.

Statements A, B, D, and E are incorrect or misuse conversion functions:

A is incorrect because TO_CHAR is used to convert dates or numbers to strings, not the other way around, and therefore should not be compared with order_date.

B is incorrect because order_date is of type DATE, and you should not compare a DATE with a string without converting it; the TO_CHAR here should be TO_DATE.

D is incorrect because it mixes TO_DATE and TO_CHAR in the same IN list, which should contain date types only.

E is incorrect because TO_DATE should take a string as an argument, not a date returned by ADD_MONTHS.

Question No. 4

Which statement falls to execute successfully?

SELECT *

FROM employees e

JOIN department d

WHERE e.department_id=d.department_id

AND d.department_id=90;

SELECT *

FROM employees e

JOIN departments d

ON e.department_id=d.department_id

WHERE d.department_id=90;

SELECT *

FROM employees e

JOIN departments d

ON e.department_id=d.department_id

AND d.department_id=90;

SELECT *

FROM employees e

JOIN departments d

ON d.departments_id=90

WHERE e.department_id=d.department_id;

ASELECT * FROM employees e JOIN department d WHERE e.department_id=d.department_id AND d.department_id=90: This statement will fail because it incorrectly uses the JOIN syntax without an ON clause, which is necessary to specify the condition on which the tables are joined. This statement mistakenly places the join condition in the WHERE clause without using ON.
Correct options (executes successfully):
B: Correctly formulated JOIN with ON and an additional condition in the WHERE clause.
C: Incorporates the filtering directly in the ON clause, which is a valid method to restrict the rows returned by the JOIN based on conditions related to both tables.
D: Although it appears awkward due to the order of conditions in the ON clause, it is syntactically correct.
These answers reflect typical use and constraints in SQL queries and are aligned with Oracle Database 12c standards for SQL syntax and operations.

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Correct Answer: A

Given the statements, the failure to execute would be due to improper SQL syntax or logical structuring of the JOIN clause:

Question No. 5

Which two are true about creating tables in an Oracle database?

AA create table statement can specify the maximum number of rows the table will contain.

BThe same table name can be used for tables in different schemas.

CA system privilege is required.

DCreating an external table will automatically create a file using the specified directory and file name.

EA primary key constraint is manadatory.

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Correct Answer: B, C

Regarding creating tables in an Oracle database:

B . The same table name can be used for tables in different schemas: In Oracle, a schema is essentially a namespace within the database; thus, the same table name can exist in different schemas without conflict, as each schema is distinct.

C . A system privilege is required: To create tables, a user must have the necessary system privileges, typically granted explicitly or through roles such as CREATE TABLE or administrative privileges depending on the environment setup.

Incorrect options for all three repeated questions:

A: Oracle SQL does not allow specifying the maximum number of rows directly in a CREATE TABLE statement; this is controlled by storage allocation and database design rather than table creation syntax.

D: Creating an external table does not create the physical file. It merely creates a table structure that allows access to data stored in an external file specified in the directory; the file itself must already exist or be managed outside of Oracle.

E: A primary key constraint is not mandatory for creating tables. While it is a common practice to define a primary key to enforce entity integrity, it is not required by the Oracle SQL syntax for table creation.

These answers and explanations are aligned with Oracle Database 12c SQL documentation and standard practices.

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