DUMPS 1Z0-071 COLLECTION - RELIABLE 1Z0-071 EXAM TEST

Dumps 1z0-071 Collection - Reliable 1z0-071 Exam Test

Dumps 1z0-071 Collection - Reliable 1z0-071 Exam Test

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Oracle Database SQL Sample Questions (Q315-Q320):

NEW QUESTION # 315
View the Exhibit and examine the structure of the PRODUCTS table.

You must display the category with the maximum number of items.
You issue this query:

What is the result?

  • A. It executes successfully but does not give the correct output.
  • B. It generate an error because the subquery does not have a GROUP BY clause.
  • C. It generates an error because = is not valid and should be replaced by the IN operator.
  • D. It executes successfully and gives the correct output.

Answer: B


NEW QUESTION # 316
Examine these statements which execute successfully:

Both statements display departments ordered by their average salaries.
Which two are true?

  • A. Only the first statement will execute successfully if you add E.AVG_SAL to the select list.
  • B. Both statements will execute successfully If you add E.AVG_SAL. to the select list.
  • C. Only the first statement will display departments with no employees.
  • D. Only the second statement will display departments with no employees.
  • E. Only the second statement will execute successfully if you add E.AVG_SAL to the select list.
  • F. Both statements will display departments with no employees.

Answer: E,F


NEW QUESTION # 317
Examine the description of the EMPLOYEES table:

Which query requires explicit data type conversion?

  • A. SELECT join_date FROM employees WHERE join_date > '10-02-2018';
  • B. SELECT join_date || ' ' || salary FROM employees;
  • C. SELECT SUBSTR(join_date, 1, 2) - 10 FROM employees;
  • D. SELECT salary + '120.50' FROM employees;
  • E. SELECT join_date + '20' FROM employees;

Answer: E


NEW QUESTION # 318
which three statements are true about indexes and their administration in an Oracle database?

  • A. AN INVISIBLE INDEX is not maintained when DML is performed on its underlying table.
  • B. The same table column can be part of a unique and non-unique index
  • C. IF a query filters on an indexed column then it will always be used during execution of query
  • D. AN INDEX CAN BE CREATED AS part of a CREATE TABLE statement
  • E. A DESCENDING INDEX IS A type of function-based index
  • F. A DROP INDEX statement always prevents updates to the table during the drop operation

Answer: A,B,D

Explanation:
A). True, a single table column can be included in both a unique index and a non-unique index, provided they are different indexes.
D). True, an invisible index is maintained during DML operations, which means it is updated when insert, update, or delete operations are performed on the table. However, it is not used by the optimizer by default for query execution unless explicitly hinted or the session is altered to consider invisible indexes.
E). True, an index can be specified in the CREATE TABLE statement using the INDEX clause to create an index on a specific column at the time of table creation.
B, C, and F are not correct: B. A descending index is simply an index that is sorted in descending order, not a type of function-based index. C. A DROP INDEX


NEW QUESTION # 319
Which statement is true about TRUNCATE and DELETE?

  • A. You can never TRUNCATE a table if foreign key constraints will be violated.
  • B. You can never tows from a table if foreign key constraints will be violated.
  • C. For tables with multiple indexes and triggers is faster than TRUNCATE.
  • D. For large tables TRUNCATE is faster than DELETE.

Answer: D


NEW QUESTION # 320
......

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