Oracle 1z1-071 Prüfungs-Guide & 1z1-071 Online Prüfungen

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Oracle 1z1-071 Exam Syllabus Topics:

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

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1z1-071 Übungstest: Oracle Database SQL & 1z1-071 Braindumps Prüfung

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Oracle Database SQL 1z1-071 Prüfungsfragen mit Lösungen (Q124-Q129):

124. Frage
Examine the structure of the PROGRAMS table:
Which two SQL statements would execute successfully?

A. SELECT NVL (MONTHS_BETWEEN (start_date, end_date), 'Ongoing') FROM
programs;
B. SELECT TO_DATE (NVL (SYSDATE-END_DATE, SYSDATE)) FROM programs;
C. SELECT NVL (ADD_MONTHS (END_DATE,1) SYSDATE) FROM programs;
D. SELECT NVL (TO_CHAR (MONTHS_BETWEEN (start-date, end_date)), 'Ongoing') FROM programs

Antwort: C,D

125. Frage
Which statements are correct regarding indexes? (Choose all that apply.)

A. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique index.
B. When a table is dropped, the corresponding indexes are automatically dropped.
C. Indexes should be created on columns that are frequently referenced as part of an expression.
D. For each DML operation performed, the corresponding indexes are automatically updated.

Antwort: A,B,D

126. Frage
Which two statements are true? (Choose two.)

A. All the dynamic performance views prefixed with V$ are accessible to all the database users.
B. DICTIONARY is a view that contains the names of all the data dictionary views that the user can access.
C. The USER SYNONYMS view can provide information about private synonyms.
D. The USER OBJECTS view can provide information about the tables and views created by the user only.
E. The user SYSTEM owns all the base tables and user-accessible views of the data dictionary.

Antwort: B,C

Begründung:
* A. The USER SYNONYMS view can provide information about private synonyms: This view contains information about private synonyms that have been created by the user. It lists all synonyms that are accessible to the user in their schema.
* E. DICTIONARY is a view that contains the names of all the data dictionary views that the user
* can access: This view lists the names of all data dictionary views available to the user, providing a directory of useful database metadata.
Incorrect options:
* B: The SYSTEM user does not own all base tables of the data dictionary; some are owned by SYS.
* C: Not all users have access to dynamic performance views prefixed with V$; access is restricted based on privileges.
* D: The USER_OBJECTS view lists all objects owned by the user, not just tables and views but also other types of schema objects like procedures and functions.

127. Frage
In which three situations does a new transaction always start?

A. When issuing a SELECT FOR UPDATE statement after a CREATE TABLE AS SELECT statement was issued in the same session
B. When issuing a TRUNCATE statement after a SELECT statement was issued in the same session
C. When issuing a CREATE INDEX statement after a CREATE TABLE statement completed unsuccessfully in the same session
D. When issuing a CREATE TABLE statement after a SELECT statement was issued in the same session
E. When issuing the first Data Manipulation Language (OML) statement after a COMMIT or ROLLBACK statement was issued in the same session
F. When issuing a DML statement after a DML statement filed in the same session.

Antwort: A,B,E

Begründung:
Substitution variables in Oracle are used to replace a value dynamically during the execution of SQL statements. The behavior of these variables is well-documented:
* C. A substitution variable prefixed with & always prompts only once for a value in a session: This is true. In a session, when you use a single ampersand (&), SQL*Plus or SQL Developer will prompt for the value the first time the variable is encountered. The value for this variable will then be reused for the remainder of the session unless it is redefined.
* D. A substitution variable can be used with any clause in a SELECT statement: Substitution
* variables can be placed in any part of a SQL statement, including the SELECT, WHERE, GROUP BY, ORDER BY, etc. They are not limited to any specific clause.
References:
* Oracle SQL*Plus User's Guide and Reference, which discusses substitution variables.

128. Frage
Which two are true about the data dictionary?

A. The SYS user owns all base tables and user-accessible views in the data dictionary.
B. The data dictionary is constantly updated to reflect changes to database objects, permissions, and data.
C. All users have permissions to access all information in the data dictionary by default
D. Base tables in the data dictionary have the prefix DBA_.
E. All user actions are recorded in the data dictionary.

Antwort: A,B

Begründung:
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

129. Frage
......

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