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Oracle 1z1-071 (Oracle Database SQL) Exam is a certification exam offered by Oracle Corporation for individuals looking to demonstrate their proficiency in SQL and Oracle Database. 1z1-071 exam is designed to test the candidate's knowledge and skills in SQL language, data modeling, database concepts, and the use of Oracle Database software. Passing 1z1-071 Exam validates the candidate's ability to work with Oracle Database and SQL, making them a valuable asset to any organization that uses these technologies.

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The Oracle 1z1-071 exam consists of 73 multiple-choice questions, and you have 105 minutes to complete it. The passing score for the 1z1-071 exam is 63%. 1z1-071 exam can be taken online or in-person at a Pearson VUE testing center. 1z1-071 exam fee is $245, and you can register for the exam on the Oracle website.

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Oracle Database SQL Sample Questions (Q258-Q263):

NEW QUESTION # 258
Which three statements are true about indexes and their administration in an Oracle database?

A. An index can be created as part of a CREATE TABLE statement.
B. A UNIQUE and non-unique index can be created on the same table column
C. If a query filters on an indexed column then it will always be used during execution of the query
D. A descending index is a type of function-based index
E. A DROP INDEX statement always prevents updates to the table during the drop operation
F. An INVISIBLE index is not maintained when Data Manipulation Language (DML) is performed on its underlying table.

Answer: A,B,D

Explanation:
A). This statement is incorrect. An INVISIBLE index is maintained during DML operations just like a VISIBLE index. The difference is that an INVISIBLE index is not used by the optimizer unless explicitly hinted. B. This statement is correct. When creating a table, you can define indexes on one or more columns as part of the table definition. C. This statement is incorrect. While a DROP INDEX statement will drop the index, it does not always prevent updates to the table. If the index is marked as unusable or is an invisible index, for example, updates can still be performed. D. This statement is correct. It is possible to have both a UNIQUE index and a non-unique index on the same column. The UNIQUE index enforces the uniqueness of column values, while the non-unique index does not. E. This statement is correct to some extent. Descending indexes are not function-based indexes per se, but they are indexes on which the data is sorted in descending order, as opposed to the default ascending order. However, descending indexes are conceptually related to function-based indexes because they alter the way the indexed data is stored. F. This statement is incorrect.
The use of an index in query execution depends on the optimizer's decision, which is based on statistics and the cost associated with using the index. There are situations where the optimizer may choose a full table scan even if there is an index on the filter column.
References can be found in the Oracle Database Concepts Guide and the SQL Language Reference documentation, which detail the behavior of indexes and how they are managed within the Oracle database.

NEW QUESTION # 259
You create a table named 123. Which statement runs successfully?

A. SELECT * FROM \ *123\' ;
B. SELECT * FROM TABLE(123);
C. SELECT * FROM "123
D. SELECT * FROM , 123* ;

Answer: C

NEW QUESTION # 260
Examine the structure of the EMPLOYEES table.
NameNull?Type
---------------------- ------------
EMPLOYEE_IDNOT NULLNUMBER(6)
FIRST_NAMEVARCHAR2(20)
LAST_NAMENOT NULLVARCHAR2(25)
EMAILNOT NULLVARCHAR2(25)
PHONE NUMBERVARCHAR2(20)
HIRE_DATENOT NULLDATE
JOB_IDNOT NULLVARCHAR2(10)
SALARYNUMBER(8,2)
COMMISSION_PCTNUMBER(2,2)
MANAGER_IDNUMBER(6)
DEPARTMENT_IDNUMBER(4)
There is a parent/child relationship between EMPLOYEE_ID and MANAGER_ID.
You want to display the last names and manager IDs of employees who work for the same manager as the employee whose EMPLOYEE_ID is 123.
Which query provides the correct output?

A. SELECT e.last_name, m.manager_idFROM employees e RIGHT OUTER JOIN employees mon (e.employee_id = m.manager_id)WHERE e.employee_id = 123;
B. SELECT m.last_name, e.manager_idFROM employees e LEFT OUTER JOIN employees mon (e.manager_id = m.manager_id)WHERE e.employee_id = 123;
C. SELECT e.last_name, e.manager_idFROM employees e RIGHT OUTER JOIN employees mon (e.employee_id = m.employee_id)WHERE e.employee_id = 123;
D. SELECT e.last_name, m.manager_idFROM employees e RIGHT OUTER JOIN employees mon (e.manager_id = m.employee_id)AND e.employee_id = 123;

Answer: A

NEW QUESTION # 261
Examine the data in the NEW_EMPLOYEES table:

Update existing employee details in the EMPLOYEES table with data from the NEW_EMPLOYEES table.
2. Add new employee details from the NEW_EMPLOYEES table to the EMPLOYEES table.
Which statement will do this?
A)

B)

C)

D)

A. Option C
B. Option B
C. Option D
D. Option A

Answer: A

NEW QUESTION # 262
Which three are key components of an Entity Relationship Model?

A. a relationship
B. an attribute
C. an activity
D. a table
E. a unique identifier
F. an entity

Answer: A,B,F

Explanation:
Key components of an Entity-Relationship Model (ERM) include:
* B. an attribute: Attributes are properties or characteristics of an entity, such as a person's name, date of birth, etc., and are essential in describing the data aspects of an entity in an ER model.
* E. a relationship: Relationships describe how entities interact with each other within the database structure, such as a customer placing an order.
* F. an entity: Entities are the key components of an ER model, representing objects or things within the domain that have a distinct existence, like 'Customer' or 'Order'.
Incorrect options:
* A: A table is a database structure used to implement an entity in relational databases, not a component of the ER model itself.
* C: While unique identifiers are crucial in database implementation (typically as primary keys), they are a specific attribute type, not a general component of ER models.
* D: An activity is not a component of an ER model; activities relate more to process models or behavioral models in systems design.

NEW QUESTION # 263
......

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