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Oracle 1z0-071 Valid Test Braindumps - Online 1z0-071 Lab Simulation

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Oracle Database SQL Sample Questions (Q85-Q90):

NEW QUESTION # 85
View the Exhibit and examine, the description for the SALES and CHANNELS tables.
(Choose the best answer.)

You issued this SQL statement:
INSERT INTO SALES VALUES (23, 2300, SYSDATE,
(SELECT CAHNNEL_ID
FROM CHANNELS
WHERE CHANNEL_DESC='DIRECT SALES'), 12, 1, 500);
Which statement is true regarding the result?

A. The statement will fail because the VALUES clause is not required with the subquery.
B. The statement will execute and a new row will be inserted in the SALES table.
C. The statement will fail because the sub-query in the VALUES clause is not enclosed within single quotation marks.
D. The statement will fail because a subquery cannot be used in a VALUES clause.

Answer: B

NEW QUESTION # 86
Examine this data in the EMPLOYEES table:

Which statement will execute successfully?
SELECT dept_id, INSTR(last_name, 'A'), SUM(salary) FROM employees GROUP BY

A. dept_id;
SELECT dept_id, STDDEV(last_name), SUM(salary) FROM employees GROUP BY
B. dept_id;
SELECT dept_id, MAX(last_name), SUM(salary) FROM employees GROUP BY dept_id;
C. dept_id;
D. SELECT dept_id, LENGTH(last_name), SUM(salary) FROM employees GROUP BY

Answer: D

Explanation:
Explanation/Reference:

NEW QUESTION # 87
Which two statements are true about sequences created in a single instance Oracle database? (Choose two.)

A. DELETE <sequencename>would remove a sequence from the database.
B. When the MAXVALUElimit for a sequence is reached, it can be increased by using the ALTER SEQUENCEstatement.
C. When a database instance shuts down abnormally, sequence numbers that have been cached but not used are available again when the instance is restarted.
D. The numbers generated by an explicitly defined sequence can only be used to insert data in one table.
E. CURRVALis used to refer to the most recent sequence number that has been generated for a particular sequence.

Answer: B,E

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 # 88
Which three statements are true about indexes and their administration in an Oracle database?

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

Answer: A,D,F

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 # 89
Evaluate the following query:
SQL> SELECT TRUNC (ROUND (156.00, -1),-1)
FROM DUAL;
What would be the outcome?

A. 0
B. 1
C. 2
D. 3
E. 4

Answer: D

Explanation:
Explanation
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions135.htm
https://docs.oracle.com/cd/B28359_01/olap.111/b28126/dml_functions_2127.htm

NEW QUESTION # 90
......

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