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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q32-Q37):

NEW QUESTION # 32
Which two statements are true regarding constraints? (Choose two.)

A. All the constraints can be defined at the column level as well as the table level
B. A constraint is enforced only for the INSERT operation on a table.
C. A column with the UNIQUE constraint can contain NULL.
D. A foreign key cannot contain NULL values.
E. A constraint can be disabled even if the constraint column contains data.

Answer: C,E

NEW QUESTION # 33
Examine the data in the PRODUCTS table:

Examine these queries:
1. SELECT prod name, prod list
FROM products
WHERE prod 1ist NOT IN(10,20) AND category _id=1;
2. SELECT prod name, | prod _ list
FROM products
WHERE prod list < > ANY (10,20) AND category _id= 1;
SELECT prod name, prod _ list
FROM products
WHERE prod_ list <> ALL (10, 20) AND category _ id= 1;
Which queries generate the same output?

A. 2 and 3
B. 1 and 2
C. 1 and 3
D. 1, 2 and 3

Answer: C

NEW QUESTION # 34
See the Exhibit and examine the structure of the PROMOTIONS table:

Using the PROMOTIONS table,
you need to find out the average cost for all promos in the range $0-2000 and $2000-5000 in category A.
You issue the following SQL statements:

What would be the outcome?

A. It generates an error because NULL cannot be specified as a return value.
B. It generates an error because CASE cannot be used with group functions.
C. It executes successfully and gives the required result.
D. It generates an error because multiple conditions cannot be specified for the WHEN clause.

Answer: C

Explanation:
Explanation/Reference:
Explanation:
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END

NEW QUESTION # 35
Examine this statement:
SELECT last name
FROM employees
ORDER BY CASE WHEN salary = (SELECT MAX(salary) FROM employees)
THEN 'A'
ELSE last_ name
END ,last_name DESC;
Which two statements are true?

A. The names of employees earning the maximum salary will appear first in descending order.
B. All remaining employee names will appear in an unspecified order.
C. All remaining employee names will appear in descending order.
D. All remaining employee names will appear in ascending order.
E. The names of employees earning the maximum salary will appear first In ascending order.
F. The names of employees earning the maximum salary will appear first in an unspecified order.

Answer: C,E

Explanation:
The ORDER BY clause with a CASE statement allows for conditional sorting based on the results of the CASE expression.
A). This is not true, as the 'A' in the THEN clause would cause the employees earning the maximum salary to be sorted at the top, but it does not determine the order in which their last names would appear.
B). This is true, the 'A' in the THEN clause will result in all maximum salary earners to be sorted at the top, and since 'A' comes before any last names alphabetically, they will be in ascending order.
C). This is not true, as the ELSE clause sorts the remaining employees by last_name but does not specify an order; hence, it defaults to ascending which contradicts the second part of the ORDER BY clause which specifies DESC.
D). This is not true, as the order of the remaining employee names is specified by the ORDER BY clause, which states last_name DESC.
E). This is true, after the employees with the maximum salary are sorted, the remaining employees' names will appear in descending order due to the last_name DESC in the ORDER BY clause.
F). This statement is not true as the specified 'A' in the CASE statement provides a definite order for employees earning the maximum salary.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ORDER BY Clause"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "CASE Expression"

NEW QUESTION # 36
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 = NULL;
B. MEMBER_ID = '';
C. MEMBER_ID = "";
D. MEMBER_ID IS NULL;

Answer: D

NEW QUESTION # 37
......

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