퍼펙트한1z0-071덤프샘플문제체험최신버전덤프데모문제다운받기

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Oracle 1z0-071 Exam Syllabus Topics:

Section	Objectives
Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
SQL Functions	- Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions - Single-row functions 1. Character, numeric, date functions
Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
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
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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1z0-071유효한 최신버전 덤프 - 1z0-071인증덤프 샘플체험

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최신 Oracle PL/SQL Developer Certified Associate 1z0-071 무료샘플문제 (Q138-Q143):

질문 # 138
Evaluate the following statement.

Which statement is true regarding the evaluation of rows returned by the subquery in the INSERTstatement?

A. They are evaluated by the first WHENclause. If the condition is true, then the row would be evaluated by the subsequent WHENclauses.
B. They are evaluated by all the three WHENclauses regardless of the results of the evaluation of any other WHENclause.
C. They are evaluated by the first WHENclause. If the condition is false, then the row would be evaluated by the subsequent WHENclauses.
D. The insert statement would give an error because the ELSEclause is not present for support in case none of WHENclauses are true.

정답：B

설명：
Explanation/Reference:
References:
http://psoug.org/definition/WHEN.htm

질문 # 139
View the Exhibit and examine the details of the ORDER_ITEMS table.

Evaluate the following SQL statements:
Statement 1:
SELECT MAX(unit_price*quantity) "Maximum Order"
FROM order_items;
Statement 2:
SELECT MAX(unit_price*quantity) "Maximum Order"
FROM order_items
GROUP BY order_id;
Which statements are true regarding the output of these SQL statements? (Choose all that apply.)

A. Statement 2 would return multiple rows of output.
B. Both the statements would give the same output.
C. Both statements would ignore NULL values for the UNIT_PRICE and QUANTITY columns.
D. Statement 1 would not return give the same output.
E. Statement 1 would return only one row of output.

정답：A,C,E

질문 # 140
Which two statements are true regarding the COUNT function? (Choose two.)

A. The COUNT function can be used only for CHAR, VARCHAR2 and NUMBER data types
B. COUNT(DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULL values in the INV_AMT column
C. COUNT(cust_id) returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_ID column
D. A SELECT statement using COUNT function with a DISTINCT keyword cannot have a WHERE clause
E. COUNT(*) returns the number of rows including duplicate rows and rows containing NULL value in any of the columns

정답：B,E

설명：
Using the COUNT Function
The COUNT function has three formats:
COUNT(*)
COUNT(expr)
COUNT(DISTINCT expr)
COUNT(*) returns the number of rows in a table that satisfy the criteria of the SELECT
statement, including duplicate rows and rows containing null values in any of the columns.
If a WHERE clause is included in the SELECT statement, COUNT(*) returns the number of
rows that satisfy the condition in the WHERE clause.
In contrast,
COUNT(expr) returns the number of non-null values that are in the column identified by
expr.
COUNT(DISTINCT expr) returns the number of unique, non-null values that are in the
column identified by expr.

질문 # 141
View the Exhibit and examine the structure in the EMPLOYEES tables.

Evaluate the following SQL statement:
SELECT employee_id, department_id
FROM employees
WHERE department_id= 50 ORDER BY department_id
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id= 90
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id= 10;
What would be the outcome of the above SQL statement?

A. The statement would execute successfully but it will ignore the ORDER BY clause and display the rows in random order.
B. The statement would not execute because the positional notation instead of the column name should be used with the ORDER BY clause.
C. The statement would not execute because the ORDER BY clause should appear only at the end of the SQL statement, that is, in the last SELECT statement.
D. The statement would execute successfully and display all the rows in the ascending order of DEPARTMENT_ID.

정답：C

질문 # 142
Which three items does a direction of a relationship contain?

A. label
B. an optionality
C. a cardinality
D. a unique identifier
E. an entity
F. an attribute

정답：A,B,C

설명：
In data modeling and database design, the direction of a relationship typically includes:
* Option B: a cardinality
* Cardinality refers to the numerical relationships between two entities, indicating the number of instances of one entity that can or must be associated with each instance of another.
* Option C: label
* A label is often used to describe the role or purpose of the relationship in a way that clarifies the nature of the interaction between entities.
* Option D: an optionality
* Optionality indicates whether or not a relationship is mandatory or optional; in other words, it shows if an instance of an entity must be related to an instance of another entity or if it can exist without such a relationship.
Options A, E, and F are not part of the direction of a relationship:
* Option A: An attribute is a property or characteristic of an entity, not the direction of a relationship.
* Option E: A unique identifier uniquely identifies each instance of an entity, not a relationship's direction.
* Option F: An entity is a thing with distinct and independent existence in a database, usually mapped to a table, not a part of the direction of a relationship.

질문 # 143
......

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참고: Itcertkr에서 Google Drive로 공유하는 무료, 최신 1z0-071 시험 문제집이 있습니다: https://drive.google.com/open?id=1QUKJXZR39ny_R7VG4Dl7yDgJtusspbXz