1z0-071 Sample Questions Answers - Exam 1z0-071 Preview

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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q37-Q42):

NEW QUESTION # 37
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

A. The outer query stops evaluating the result set of the inner query when the first value is found.
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. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.

Answer: A,C

Explanation:
Explanation
http://www.techonthenet.com/oracle/exists.php

NEW QUESTION # 38
Which three statements are true about Structured Query Language (SQL)? (Choose three.)

A. It provides independence for logical data structures being manipulated from the underlying physical data storage.
B. It requires that data be contained in hierarchical data storage.
C. It guarantees atomicity, consistency, isolation, and durability (ACID) features.
D. It is the only language that can be used for both relational and object-oriented databases.
E. It best supports relational databases.
F. It is used to define encapsulation and polymorphism for a relational table.

Answer: A,B,C

Explanation:
Explanation/Reference: https://docs.microsoft.com/en-us/sql/relational-databases/hierarchical-data-sql-server?view=sql- server-2017

NEW QUESTION # 39
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 large tables TRUNCATE is faster than DELETE.
D. For tables with multiple indexes and triggers is faster than TRUNCATE.

Answer: C

Explanation:
A: True. TRUNCATE is generally faster than DELETE for removing all rows from a table because TRUNCATE is a DDL (Data Definition Language) operation that minimally logs the action and does not generate rollback information. TRUNCATE drops and re-creates the table, which is much quicker than deleting rows one by one as DELETE does, especially for large tables. Also, TRUNCATE does not fire triggers.
References:
* Oracle documentation specifies that TRUNCATE is faster because it doesn't generate redo logs for each row as DELETE would.
* TRUNCATE cannot be rolled back once executed, since it is a DDL command and does not generate rollback information as DML commands do.

NEW QUESTION # 40
Examine the structure of the BOOKS_TRANSACTIONStable.

You want to update this table such that BOOK_IDis set to 'INVALID'for all rows where no MEMBER_ID has been entered.
Examine this partial SQL statement:

Which condition must be used in the WHEREclause to perform the required update?

A. MEMBER_ID IS NULL;
B. MEMBER_ID = NULL;
C. MEMBER_ID = '';
D. MEMBER_ID = "";

Answer: A

NEW QUESTION # 41
In which three situations does a transaction complete? (Choose three.)

A. when a DELETE statement is executed
B. when a TRUNCATE statement is executed after the pending transaction
C. when a PL/SQL anonymous block is executed
D. when a ROLLBACK command is executed
E. when a data definition language (DDL) statement is executed

Answer: B,D,E

Explanation:
https://docs.oracle.com/cd/B19306_01/server.102/b14220/transact.htm

NEW QUESTION # 42
......

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