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Quiz 1z0-071 - Marvelous Reliable Oracle Database SQL Test Notes
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Oracle 1z0-071 is a certification exam that focuses on the fundamentals of SQL and relational database management using Oracle Database. 1z0-071 exam is designed to test the knowledge and skills of candidates in the area of SQL and database management. Passing 1z0-071 exam is a requirement for obtaining the Oracle Database SQL certification, which is a valuable asset for professionals working in the database administration field.
Oracle 1z1-071 Certification Exam is a challenging but rewarding certification exam for database professionals who want to demonstrate their skills and knowledge in Oracle Database SQL. It covers a wide range of topics and requires candidates to have a solid understanding of SQL fundamentals and Oracle Database concepts. Passing the exam can enhance your career prospects and lead to higher salaries, promotions, and new job opportunities.
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Oracle 1z1-071 (Oracle Database SQL) certification exam is designed to test the skills and knowledge of individuals who work with Oracle Database SQL. 1z0-071 Exam is intended for database administrators, developers, and anyone else who works with Oracle Database SQL. Those who pass the exam will receive the Oracle Database SQL certification, which demonstrates their proficiency in working with Oracle Database SQL.
Oracle Database SQL Sample Questions (Q269-Q274):
NEW QUESTION # 269
Examine the following query:
What is the output of this query?
- A. It displays the first 5 percent of the rows from the SALES table.
- B. It displays 5 percent of the products with the lowest amount sold.
- C. It results in an error because the ORDER BY clause should be the last clause.
- D. It displays 5 percent of the products with the highest amount sold.
Answer: B
NEW QUESTION # 270
Examine these statements and results
SQL> SELECT COUNT(*) FROM emp
COUNT(*)
---------------------
14
sQL> CREATE GLOBAL TEMPORARY TABLE t emp As SELECT * FROM emp;
Table created
SQL> INSERT INTo temp SELECT * FROM emp;
14 rows created
SQL> COMMIT:
Commit complete*
SQL> INSERT INTo temp SELECT * EROM emp;
14. rows created
SQL> SELECT COUNT(*) FROM t emp
How many rows are retrieved by the last query?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
Global temporary tables in Oracle Database are designed to hold temporary data for the duration of a session or a transaction.
Given that the global temporary table is created and then populated twice from the emp table without any mention of data deletion, one would initially think the count would be 28, since 14 rows are inserted twice.
However, if the temporary table was created with the default ON COMMIT DELETE ROWS option, the rows are deleted at the end of the transaction, which is signified by the COMMIT operation.
Thus, after the first COMMIT, the temporary table would be empty. After the second INSERT, another 14 rows would be added. So, the last query would retrieve 14 rows unless a DELETE operation was committed.
NEW QUESTION # 271
Which two tasks can be performed by using Oracle SQL statements?
- A. starting up a database instance
- B. connecting to a database instance
- C. executing operating system (OS) commands in a session
- D. querying data from tables across databases
- E. changing the password for an existing database user
Answer: D,E
Explanation:
Explanation/Reference:
References:
http://www.techonthenet.com/oracle/password.php
https://docs.oracle.com/cd/B28359_01/server.111/b28324/tdpii_distdbs.htm
NEW QUESTION # 272
Which two are true about the data dictionary?
- A. All user actions are recorded in the data dictionary.
- B. The data dictionary is constantly updated to reflect changes to database objects, permissions, and data.
- C. Base tables in the data dictionary have the prefix DBA_.
- D. The SYS user owns all base tables and user-accessible views in the data dictionary.
- E. All users have permissions to access all information in the data dictionary by default
Answer: B,D
Explanation:
C . True, the data dictionary is constantly updated to reflect changes to the metadata of the database objects, permissions, and structures, among other things.
E . True, the SYS user owns all base tables in the data dictionary. These base tables underlie all data dictionary views that are accessible by the users.
A, B, and D are not correct because: A. Base tables do not necessarily have the prefix DBA_; instead, DBA_ is a prefix for administrative views that are accessible to users with DBA privileges. B. The data dictionary records metadata about the actions, not the actions themselves. D. Not all users have access to all information in the data dictionary. Access is controlled by privileges.
Reference:
Oracle documentation on data dictionary and dynamic performance views: Oracle Database Reference Understanding the Oracle data dictionary: Oracle Database Concepts
NEW QUESTION # 273
Examine this partial statement:
SELECT ename, sal,comm FROM emp
Now examine this output:
WHICH ORDER BY clause will generate the displayed output?
- A. ORDER BY NVL(comm,0) ASC NULLS FIRST, ename
- B. ORDER BY NVL(enam,0) DESC, ename
- C. ORDER BY comm DESC NULLS LAST, ename
- D. ORDER BY NVL(comm,0) ASC NULLS LAST, ename
Answer: A
Explanation:
The ORDER BY clause is used in a SELECT statement to sort the returned rows by one or more columns.
A . This clause would attempt to order by ename as if it were a numeric column, which is not correct since ename is not numeric.
B . This is the correct answer. The NVL function replaces nulls with the specified value, in this case, 0. This clause sorts by comm, with nulls considered as 0 and appearing first, followed by the actual values, and then sorts by ename.
C . This clause is incorrect because it would place null values at the end, but in the output, rows with null comm appear at the beginning.
D . This clause would sort the comm in descending order with the nulls at the end, which is not consistent with the output shown.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ORDER BY Clause" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "NVL Function" Please note that the correct formatting of SQL statements and clauses is crucial for the successful execution of queries.
NEW QUESTION # 274
......
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