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Oracle 1z1-071 Exam consists of 73 multiple-choice questions that must be completed in 100 minutes. The questions are designed to test the candidate's understanding of SQL and its various functions. 1z1-071 exam covers topics such as creating and managing tables, manipulating data, using SQL functions, and controlling user access to data. 1z1-071 Exam also covers the basics of SQL syntax and how to write SQL statements.

Oracle Database SQL Sample Questions (Q255-Q260):

NEW QUESTION # 255
Examine the description of the PRODUCTS table:

Which three queries use valid expressions?

A. SPLECT product_id, expiry_date * 2 FROM products;
B. SELECT product_id,unit_price || "Discount", unit_price + surcharge-discount FROM products;
C. SELECT ptoduct_id, (expiry_date-delivery_date) * 2 FROM products;
D. SELEGT product_id, unit_price, unit_price + surcharge FROM products;
E. SELECT product_id, (unit_price * 0.15 / (4.75 + 552.25)) FROM products;
F. SELECT produet_id, unit_pricer, 5 "Discount",unit_price+surcharge-discount FROM products;

Answer: C,D,E

Explanation:
B . SELECT product_id, (unit_price * 0.15 / (4.75 + 552.25)) FROM products; C. SELECT product_id, (expiry_date - delivery_date) * 2 FROM products; E. SELECT product_id, unit_price, unit_price + surcharge FROM products; Comprehensive and Detailed Explanation WITH all Reference:
A . This is invalid because "Discount" is a string literal and cannot be used without quotes in an arithmetic operation. Also, there is a typo in unit_pricer, and 'discount' is not a defined column in the table. B. This is valid. It shows a mathematical calculation with unit_price, which is of NUMBER type. Division and multiplication are valid operations on numbers. C. This is valid. The difference between two DATE values results in the number of days between them, and multiplying this value by a number is a valid operation. D. This is invalid because expiry_date is of DATE type and cannot be multiplied by a number. Also, there's a typo: "SPLECT" should be "SELECT". E. This is valid. Both unit_price and surcharge are NUMBER types, and adding them together is a valid operation. F. This is invalid because concatenation operator || is used between a number (unit_price) and a string literal "Discount", which is not enclosed in single quotes, and 'discount' is not a defined column in the table.
In SQL, arithmetic operations on numbers and date arithmetic are valid expressions. Concatenation is also a valid expression when used correctly between string values or literals. Operations that involve date types should not include multiplication or division by numbers directly without a proper interval type in Oracle SQL.
These rules are detailed in the Oracle Database SQL Language Reference, where expressions, datatype precedence, and operations are defined.

NEW QUESTION # 256
Which two are true about unused columns?

A. A primary key column cannot be set to unused.
B. A foreign key column cannot be set to unused.
C. Once a column has been set to unused, a new column with the same name can be added to the table.
D. Unused columns retain their data until they are dropped
E. A query can return data from unused columns, but no DML is possible on those columns.
F. The DESCRIBE command displays unused columns

Answer: C,D

Explanation:
Unused columns are a feature in Oracle that allows a column to be marked as unused without immediately dropping it from the table structure. The key points for each option are:
A . The DESCRIBE command does not display unused columns. These columns are also not visible in user_tab_cols but are visible in user_unused_col_tabs.
B . Primary key columns can be set to unused, but you must drop the primary key constraint before doing so.
C . Once a column is marked as unused, it is not possible to query it, and Oracle will not allow DML operations on that column.
D . This is true. Once a column is set to unused, you can add a new column with the same name because Oracle essentially considers the unused column as removed from the table.
E . Just like primary key columns, a foreign key column can be marked as unused, but you must drop the foreign key constraint first.
F . This is true. Unused columns retain their data until the column is dropped using the DROP UNUSED COLUMNS command.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE" Oracle Database Administrator's Guide, 12c Release 1 (12.1)

NEW QUESTION # 257
Examine the structure of the MEMBERS table:

Examine the SQL statement:
SQL > SELECT city, last_name LNAME FROM MEMBERS ORDER BY 1, LNAME DESC; What would be the result execution? (Choose the best answer.)

A. It displays all cities in ascending order, within which the last names are further sorted in descending order.
B. It fails because a column number and a column alias cannot be used together in the ORDER BY clause.
C. It displays all cities in descending order, within which the last names are further sorted in descending order.
D. It fails because a column alias cannot be used in the ORDER BY clause.

Answer: A

NEW QUESTION # 258
Which two statements are true about transactions in the Oracle Database server?

A. A user can always see uncommitted updates made by the same user in a different session.
B. A session can always see uncommitted updates made by itself.
C. If a session has an uncommitted transaction, then a DDL statement issue a COMMIT before starting a new transaction.
D. A Data Definition Language (DDL) statement does a commit automatically only for the data dictionary updates caused by the DDL
E. An uncommitted transaction commits automatically if the user exits SQL*Plus
F. Data Manipulation Language (DML) statements always start a new transaction.

Answer: B,F

Explanation:
A: Incorrect. An uncommitted transaction is not automatically committed if the user exits SQL*Plus. It is rolled back unless otherwise specified. B. Correct. A DML statement such as INSERT, UPDATE, or DELETE will implicitly start a new transaction if there is no current transaction running in the session. C. Incorrect. A user cannot see uncommitted updates made by another session; a session can only see its own uncommitted changes. D. Incorrect. A Data Definition Language (DDL) statement automatically commits any outstanding transactions in the session, not just the changes to the data dictionary. E. Correct. A session can always see its own uncommitted updates. This is because Oracle uses a multiversion consistency model, allowing each user to see a consistent view of the data including their own changes. F. Incorrect but close. If a session has an uncommitted transaction, then a DDL statement does issue a COMMIT before executing and starting a new implicit transaction, not just for the data dictionary updates but for all pending changes in the session.
This information can be verified in the Oracle Database SQL Language Reference and Oracle Database Concepts documentation, which discuss transaction management and the behavior of DML and DDL statements within transactions.

NEW QUESTION # 259
Examine the structure of the EMPLOYEES table.

You must display the details of employees who have manager with MANAGER_ID 100, who were hired in the past 6 months and who have salaries greater than 10000.
Which query would retrieve the required result?

A. SELECT last_name, hire_date, salaryFROM employeesWHERE manager_id = (SELECT employee_id FROM employees WHERE employee_id = 100)UNION ALL(SELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE-180INTERSECTSELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000);
B. SELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000UNION ALLSELECT last_name, hire_date, salaryFROM employeesWHERE manager_ID = (SELECT employee_id FROM employees WHERE employee_id = 100)INTERSECTSELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE-180;
C. SELECT last_name, hire_date, salaryFROM employeesWHERE manager_id = (SELECT employee_id FROM employees WHERE employee_id = '100')UNIONSELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE-180INTERSECTSELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000;
D. (SELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000UNION ALLSELECT last_name, hire_date, salaryFROM employeesWHERE manager_ID = (SELECT employee_id FROM employees WHERE employee_id = 100))UNIONSELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE-180;

Answer: C

NEW QUESTION # 260
......

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