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Oracle 1z0-071 Exam Syllabus Topics:

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

>> 1z0-071 Antworten <<

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Oracle Database SQL 1z0-071 Prüfungsfragen mit Lösungen (Q158-Q163):

158. Frage
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

A. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.
B. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.
C. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
D. The outer query stops evaluating the result set of the inner query when the first value is found.

Antwort: C,D

Begründung:
References:
http://www.techonthenet.com/oracle/exists.php

159. Frage
Which three statements are true about performing DML operations on a view with no Instead of triggers defined?

A. Views cannot be used to add rows to an underlying table if the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
B. Insert statements can always be done on a table through a view.
C. Delete statements can always be done on a table tough a view.
D. WITH CHECK clause has no effect when deleting rows from the underlying table through the view.
E. Views cannot be used to query rows from an underlying table if the table has a PRIMARY KEY and the PRIMARY KEY columns are not referenced in the defining query of the view.
F. Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCT keyword.

Antwort: A,C,F

Begründung:
When performing DML operations on a view without INSTEAD OF triggers:
* Option C: Views cannot be used to add rows to an underlying table if the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
* This is true because the view would not provide values for NOT NULL columns without defaults, leading to an error.
* Option D: Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCT keyword.
* Using DISTINCT in the view's defining query can make the view non-updatable, as it may aggregate multiple rows into one.
* Option E: Delete statements can always be done on a table through a view.
* Deletes through a view are typically unrestricted as long as the view does not involve aggregates, DISTINCT, or similar constructs that would logically preclude determining which underlying rows should be deleted.

160. Frage
Examine these statements executed in a single Oracle session:

Which three statements are true? (Choose three.)

A. The code for fountain pen is 3.
B. The code for pen is 10.
C. The code for pen is 1.
D. There is no row containing pen.
E. There is no row containing pencil.
F. There is no row containing fountain pen.

Antwort: A,C,E

161. Frage
No-user-defined locks are used in your database.
Which three are true about Transaction Control Language (TCL)?

A. ROLLBACKwithout the TO SAVEPOINT clause undoes all the transaction's changes but does not erase its savepoints.
B. ROLLBACKwithout the TO SAVEPOINT clause undoes all the transaction's changes, releases its locks and erases its savepoints.
C. ROLLBACK TO SAVEPOINT undoes the transaction's changes made since the named savepoint and then ends the transaction.
D. COMMITends the transaction and makes all its changes permanent.
E. COMMITerases all the transaction's savepoints and releases its locks.
F. ROLLBACKwithout the TO SAVEPOINT clause undoes all the transaction's changes but does not release its locks.

Antwort: B,D,E

Begründung:
Explanation/Reference: https://docs.oracle.com/cd/A58617_01/server.804/a58233/trans.htm
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9021.htm

162. Frage
Which two are true about external tables that use the ORACLE _DATAPUMP access driver?

A. Creating an external table creates a directory object.
B. Creating an external table creates a dump file that can be used by an external table in the same or a different database.
C. When creating an external table, data can be selected from another external table or from a table whose rows are stored in database blocks.
D. Creating an external table creates a dump file that can be used only by an external table in the same database.
E. When creating an external table, data can be selected only from a table whose rows are stored in database blocks.

Antwort: C

Begründung:
External tables using the ORACLE_DATAPUMP access driver have specific characteristics:
C). Creating an external table using the ORACLE_DATAPUMP access driver allows you to select data from other tables, including another external table or a regular table whose rows are stored in database blocks.
A, B, D, and E are incorrect. Specifically:
* A is incorrect because creating an external table does not automatically create a directory object; the
* directory object must exist prior to or be created separately.
* B is incorrect as it limits the creation to tables stored in database blocks, which is not a restriction.
* D is incorrect because creating an external table does not create a dump file; it reads from an existing dump file created by Data Pump.
* E is also incorrect because the dump file is not created as part of the external table creation process.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "CREATE TABLE" for External Tables

163. Frage
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