1z1-071 Questions and Answers: Oracle Database SQL & 1z1-071 Practice Test

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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
Topic 2: SQL Functions	- Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions - Single-row functions 1. Character, numeric, date functions
Topic 3: Data Manipulation and Schema Objects	- DDL operations 1. CREATE, ALTER, DROP tables and constraints - DML operations 1. INSERT, UPDATE, DELETE, MERGE
Topic 4: Relational Database Concepts	- Data types and database objects overview - Tables, rows, columns, and relational model basics
Topic 5: SQL Retrieval	- SELECT statements and filtering data 1. ORDER BY and row limiting 2. WHERE clause and conditions - Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS

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Oracle Database SQL Sample Questions (Q325-Q330):

NEW QUESTION # 325
Which three statements are true about defining relations between tables in a relational database?

A. Unique key columns allow null values
B. Foreign key columns allow null values.
C. Every foreign key value must refer to a matching primary or unique key value.
D. Every primary or unique key value must refer to a matching foreign key value.
E. Primary key columns allow null values.

Answer: B,C

Explanation:
A). Correct. Foreign key constraints can be nullable. This allows the possibility of a row not having a link to another table. B. Incorrect. Unique key constraints do not allow multiple rows to have null values unless the constraint is defined on multiple columns. C. Incorrect. Primary key columns must be NOT NULL and unique across the table. D. Incorrect. Primary or unique key values do not refer to foreign keys; it's the foreign keys that refer to primary or unique keys. E. Correct. Foreign key constraints enforce referential integrity by requiring that each foreign key value matches a primary or unique key value in the related table.
These are standard rules in relational databases, which can be confirmed in the Oracle Database Concepts Guide.

NEW QUESTION # 326
You execute these commands:
SQL> DEFINE hiredate = '01-APR -2011';
SQL> SELECT employee_id, first_name, salary FROM employees WHERE hire date > &hiredate AND manager_id >&mgr_id; For which substitution variables will you be prompted?

A. none
B. only &hiredate
C. &hiredate and &mgr_id
D. only &mgr_id

Answer: D

Explanation:
* D. only &mgr_id: Since the hiredate variable is already defined before the SELECT statement, you will not be prompted for &hiredate again. However, &mgr_id has not been defined, so you will be prompted for this substitution variable.

NEW QUESTION # 327
MANAGER is an existing role with no privileges or roles.
EMP is an existing role containing the CREATE TABLE privilege.
EMPLOYEES is an existing table in the HR schema.
Which two commands execute successfully?

A. GRANT SELECT, INSERT ON hr.employees TO manager WITH GRANT OPTION:
B. GRANT CREATE TABLE, emp TO manager;
C. GRANT CREATE TABLE, SELECT ON hr. employees TO manager;
D. GRANT CREATE ANY SESSION, CREATE ANY TABLE TO manager;
E. GRANT CREATE SEQUENCE TO manager, emp;

Answer: D,E

Explanation:
In Oracle SQL, roles can be granted privileges and other roles, and these privileges can then be passed on to users.
* Statement A is correct: GRANT CREATE SEQUENCE TO manager, emp; successfully grants the CREATE SEQUENCE privilege to both the manager and emp roles.
* Statement E is correct: GRANT CREATE ANY SESSION, CREATE ANY TABLE TO manager; successfully grants two system privileges to the manager role.
* Statements B, C, and D are incorrect for the following reasons:
* B is incorrect because the correct syntax to grant object privileges includes separating privileges with commas, not spaces, and the object name should be in singular form (hr.employees).
* C is incorrect because you cannot grant a role and a privilege in the same statement.
* D is incorrect because the correct syntax for granting object privileges does not include the privilege CREATE TABLE before specifying the object (hr.employees).

NEW QUESTION # 328
The first DROP operation is performed on PRODUCTS table using the following command:
DROP TABLE products PURGE;
Then you performed the FLASHBACK operation by using the following command:
FLASHBACK TABLE products TO BEFORE DROP;
Which statement describes the outcome of the FLASHBACK command?

A. It is not possible to recover the table structure, data, or the related indexes.
B. It recovers the table structure, data, and the indexes.
C. It recovers only the table structure.
D. It recovers the table structure and data but not the related indexes.

Answer: A

NEW QUESTION # 329
Examine the description of the CUSTONERS table

CUSTON is the PRIMARY KEY.
You must derermine if any customers'derails have entered more than once using a different costno,by listing duplicate name Which two methode can you use to get the requlred resuit?

A. RIGHT OUTER JOIN with seif join
B. SUBQUERY
C. FULL OUTER JOIN with seif join
D. LEFT OUTER JOIN with seif join
E. seif join

Answer: B,E

NEW QUESTION # 330
......

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