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Oracle 1z0-071 Exam Overview:

Certification Vendor:	Oracle
Exam Name:	Oracle Database SQL
Exam Number:	1Z0-071
Passing Score:	63%
Exam Price:	US$245
Certificate Validity Period:	18 months
Real Exam Qty:	63 - 78
Available Languages:	Simplified Chinese, Korean, Spanish, Traditional Chinese, English, Japanese
Related Certifications:	Oracle Database Administrator Certified Associate Oracle Database Developer Certified Associate
Exam Duration:	120 minutes
Exam Format:	Multiple Select, Multiple Choice
Recommended Training:	Oracle Database 19c: SQL Workshop Oracle Database SQL Fundamentals
Exam Registration:	Oracle University Registration Pearson VUE Registration
Sample Questions:	Oracle 1z0-071 Sample Questions
Exam Way:	Online proctored or Onsite at Pearson VUE test centers
Pre Condition:	No mandatory prerequisites; basic knowledge of SQL and relational databases recommended
Official Syllabus URL:	https://education.oracle.com/pexam_1Z0-071

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Oracle Database SQL exam, also known as 1z1-071, is a certification exam that validates the skills and knowledge of professionals who want to work with Oracle Database SQL. It tests the candidate's ability to write SQL queries to retrieve data from a database, manipulate and analyze data, and create database objects such as tables, views, and indexes.

Oracle Database SQL Sample Questions (Q427-Q432):

NEW QUESTION # 427
Which three statements are true about the ALTER TABLE....DROP COLUMN....
command?

A. A dropped column can be rolled back.
B. A parent key column in the table cannot be dropped.
C. A column can be dropped only if it does not contain any data.
D. A column can be dropped only if another column exists in the table.
E. The column in a composite PRIMARY KEY with the CASCADE option can be dropped.

Answer: B,D,E

NEW QUESTION # 428
On your Oracle 12c database, you invoked SQL *Loader to load data into the EMPLOYEES table in the HR schema by issuing the following command:
$> sqlldr hr/hr@pdb table=employees
Which two statements are true regarding the command?

A. It fails because no SQL *Loader data file location is specified.
B. It succeeds with default settings if the EMPLOYEES table belonging to HR is already defined in the database.
C. It fails because no SQL *Loader control file location is specified.
D. It fails if the HR user does not have the CREATE ANY DIRECTORY privilege.

Answer: B,D

Explanation:
Note:
*SQL*Loader is invoked when you specify the sqlldr command and, optionally, parameters that establish session characteristics.

NEW QUESTION # 429
Which two statements are true regarding the COUNT function? (Choose two.)

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

Answer: A,B

Explanation:
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.

NEW QUESTION # 430
Which two statements are true regarding the execution of the correlated subqueries? (Choose two.)

A. The nested query executes after the outer query returns the row.
B. The nested query executes first and then the outer query executes.
C. Each row returned by the outer query is evaluated for the results returned by the inner query.
D. The outer query executes only once for the result returned by the inner query.

Answer: A,C

Explanation:
Explanation

NEW QUESTION # 431
Examine the description of the CUSTOMERS table:

Which three statements will do an implicit conversion?

A. SELECT. FRON customers WE TO DATE (Insert _ date) = DATE '2019-01-01';
B. SELECT * FROM customers WHERE customer_ id = 0001;
C. SELECT * FROM customers WHERE customer id = '0001';
D. SELECT. FROM customers WHERE insert_ date = DATE *2019-01-01';
E. SELECT FROM customers WHERE insert date = '01-JAN-19';
F. SELECT * FROM customers WHERE TO_ CHAR (customer_ id) = '0001';

Answer: C,D,E

Explanation:
A: No implicit conversion is done here because TO_CHAR is an explicit conversion from a numeric to a string data type.
B: Implicit conversion happens here because the '0001' string will be automatically converted to a numeric data type to match the CUSTOMER_ID field.
C: No implicit conversion is needed because 0001 is already a numeric literal.
D: Implicit conversion occurs here because the string '01-JAN-19' will be converted to a date type to compare with INSERT_DATE.
E: No implicit conversion; DATE is explicitly specified using the DATE keyword.
F: Incorrect syntax, it has typographical errors and also TO_DATE is an explicit function, not an implicit conversion.
Reference for SQL functions, conversions, and the CROSS JOIN behavior can be found in the Oracle Database SQL Language Reference 12c documentation.

NEW QUESTION # 432
......

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