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Oracle 1z1-071 exam covers a range of topics related to SQL and Oracle Database. 1z0-071 exam evaluates the candidate's understanding of SQL basics, data manipulation, data retrieval, and data control statements. 1z0-071 exam also covers topics such as schema objects, constraints, views, and indexes. 1z0-071 Exam measures the candidate's ability to work with advanced SQL features, such as subqueries, set operators, and analytic functions.

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Oracle Database SQL Sample Questions (Q201-Q206):

NEW QUESTION # 201
Examine this statement:

What is returned upon execution?

A. an error
B. 2 rows
C. 1 row
D. 0 rows

Answer: B

NEW QUESTION # 202
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?

A. Active Session History (ASH) report
B. AWR Compare Period report
C. Taking a new snapshot and comparing it with a preserved snapshot
D. Compare Period ADDM report

Answer: B

Explanation:
The awrddrpt.sql report is the Automated Workload Repository Compare Period Report. The awrddrpt.sql script is located in the $ORACLE_HOME/rdbms/admin directory.
Incorrect:
Not A:Compare Period ADDM
Use this report to perform a high-level comparison of one workload replay to its capture or to another replay of the same capture. Only workload replays that contain at least 5 minutes of database time can be compared using this report.

NEW QUESTION # 203
Which three statements are true about multiple row subqueries?

A. They can return multiple columns.
B. They can contain GROUP BY clauses.
C. Two or more values are always returned from the subquery.
D. They can contain HAVING clauses.
E. They cannot contain subquery.

Answer: A,B,D

Explanation:
Multiple row subqueries are subqueries that are used where a subquery is allowed, but they can return more than one row. This means they can be used with operators that allow multiple values like IN, ANY, ALL, etc.
Option A: They can contain HAVING clauses. This is true. A multiple row subquery can use aggregate functions and, therefore, can include a HAVING clause to filter the results of these aggregates. A HAVING clause is used in a similar way to a WHERE clause, except that it is used to filter rows after an aggregation is performed.
Option D: They can return multiple columns. This is true. A multiple row subquery can indeed return more than one column, which can be used in the outer query, depending on the context, such as in the column comparison subqueries.
Option E: They can contain GROUP BY clauses. This is true. Since multiple row subqueries can include aggregate functions, they can also include a GROUP BY clause to specify the grouping of data on which to apply the aggregate functions.
Regarding the incorrect options:
Option B: Two or more values are always returned from the subquery. This is false. Multiple row subqueries have the potential to return multiple rows, but they are not required to do so. They could return zero, one, or multiple rows depending on the data and the specific query.
Option C: They cannot contain subquery. This is false. Multiple row subqueries can contain other subqueries within them, which are known as nested subqueries.
For further reading and verification of these points, one can refer to the Oracle Database SQL Language Reference 12c, specifically the sections on subquery syntax and semantics, which discuss the use of HAVING, GROUP BY, and the ability of subqueries to return multiple rows or columns.

NEW QUESTION # 204
Which two statements are true about sequences created in a single instance database? (Choose two.)

A. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted.
B. DELETE <sequencename>would remove a sequence from the database.
C. When the MAXVALUElimit for the sequence is reached, you can increase the MAXVALUElimit by using the ALTERSEQUENCEstatement.
D. CURRVALis used to refer to the last sequence number that has been generated.
E. The numbers generated by a sequence can be used only for one table.

Answer: C,D

Explanation:
Explanation/Reference:
References:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm

NEW QUESTION # 205
View the exhibit and examine the description of the EMPLOYEES table. (Choose two.) You executed this SQL statement:
SELECT first_name, department_id, salary
FROM employees
ORDER BY department_id, first_name, salary desc;
Which two statements are true regarding the result?

A. The values in the SALARY column would be returned in descending order for all employees having the same value in the DEPARTMENT_ID and FIRST_NAME column.
B. The values in the FIRST_NAME column would be returned in ascending order for all employees having the same value in the DEPARTMENT_ID column.
C. The values in the FIRST_NAME column would be returned in descending order for all employees having the same value in the DEPARTMENT_ID column.
D. The values in the SALARY column would be returned in descending order for all employees having the same value in the DEPARTMENT_ID column.
E. The values in the all columns would be returned in descending order.

Answer: A,B

NEW QUESTION # 206
......

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