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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
SQL Retrieval	- SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting - Joins and set operations 1. UNION, INTERSECT, MINUS 2. INNER, OUTER, CROSS joins
Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
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
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 (Q93-Q98):

NEW QUESTION # 93
Which statement is true regarding the UNIONoperator?

A. Null values are not ignored during duplicate checking.
B. By default, the output is not sorted.
C. The number of columns selected in all select statements need not be the same.
D. Names of all columns must be identical across all select statements.

Answer: A

Explanation:
Explanation/Reference:

NEW QUESTION # 94
Which two queries return the string Hello! we're ready?

A. SELECT q'! Hello! We're ready! 'FROM DUAL;
B. SELECT q'[Hello! We're ready]'FROM DUAL;
C. SELECT 'Hello! We're ready' FROM DUAL;
D. SELECT "Hello! We're ready "FROM |DUAL;
E. SELECT 'Hello! we\ re ready' ESCAPE'N'FROMDUAL:

Answer: A,B

Explanation:
In Oracle SQL, the q quote operator can be used to define string literals that contain single quotes or other special characters without needing to escape them. The queries using the q quote mechanism, like in options A and C, will successfully return the string as it is, including single quotes within the string.
* A: Correct, it uses the q quote operator with the exclamation mark ! as the delimiter, which allows the string to contain single quotes.
* B: Incorrect, double quotes " in Oracle SQL are used for identifiers such as column names, not string literals.
* C: Correct, this also uses the q quote operator, with the square brackets [] as the delimiters.
* D: Incorrect, the backslash \ is not used as an escape character in Oracle SQL string literals, and the ESCAPE keyword is used incorrectly here.
* E: Incorrect, this does not account for the single quote within the string, which would terminate the string literal prematurely, and it lacks the q quote operator or proper escape mechanism.

NEW QUESTION # 95
Which three items does a direction of a relationship contain?

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

Answer: A,D,E

Explanation:
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.

NEW QUESTION # 96
Examine this SQL statement:
DELETE FROM employees e
WHERE EXISTS
(SELECT'dummy'
FROM emp_history
WHERE employee_id = e.employee_id)
Which two are true?

A. The subquery is not a correlated subquery.
B. The subquery is executed before the DELETE statement is executed.
C. All existing rows in the EMPLOYEE table are deleted.
D. The subquery is executed for every row in the EMPLOYEES table.
E. The DELETE statement executes successfully even if the subquery selects multiple rows.

Answer: D,E

Explanation:
The provided DELETE statement uses a correlated subquery to determine which rows should be deleted from the EMPLOYEES table.
A . The subquery is indeed executed for every row in the EMPLOYEES table. This is because it references e.employee_id, which is a column from the outer query, making it a correlated subquery.
B . The subquery is a correlated subquery, as explained above.
C . The subquery is executed for each row, not before the DELETE statement.
D . Not all existing rows in the EMPLOYEES table are deleted, only those that have a corresponding employee_id in the EMP_HISTORY table.
E . The DELETE statement executes successfully even if the subquery selects multiple rows because the EXISTS condition only checks for the presence of rows, not their count.
Reference:
Oracle Database SQL Language Reference 12c Release 1 (12.1), DELETE Statement Oracle Database SQL Language Reference 12c Release 1 (12.1), Subquery Factoring Oracle Database SQL Language Reference 12c Release 1 (12.1), Correlated Subqueries

NEW QUESTION # 97
Examine the description of the EMPLOYEES table

Which two queries return the highest salary in the table?

A. SELECT MAX (salary)
FROM employees
GROUP BY department_id;
B. SELECT MAX (MAX (salary))
FROM employees
GROUP BY department_id;
C. SELECT MAX (salary)
FROM employees;
D. SELECT department_id, MAX(salary)
FROM employees
GROUP BY department_id;
E. SELECT MAX (salary)
FROM employees
GROUP BY department_id
HAVING MAX (salary) = MAX (MAX (salary));

Answer: B,C

NEW QUESTION # 98
......

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