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Oracle 1z1-071 certification exam covers a broad range of topics that are considered essential for anyone seeking to become an expert in database management. 1z0-071 Exam Tests an individual's skill in designing, manipulating, retrieving, and managing SQL database applications. It also emphasizes the ability to utilize advanced SQL features such as subqueries, data validation, and data manipulation.

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Oracle Database SQL Sample Questions (Q252-Q257):

NEW QUESTION # 252
Examine the structure of the PROMOTIONS table: (Choose the best answer.)

Management requires a report of unique promotion costs in each promotion category.
Which query would satisfy this requirement?

A. SELECT DISTINCT promo_cost, DISTINCT promo_category FROM promotions;
B. SELECT promo_category, DISTINCT promo_cost FROM promotions
C. SELECT DISTINCT promo_cost, promo_category FROM promotions
D. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1

Answer: D

NEW QUESTION # 253
Examine the types and examples of relationship that follow:
1 One-to-one a) teacher to Student
2 One-to-many b) Employees to Manager
3 Many-to-one c) Person to SSN
4 Many-to-many d) Customers to Products
Which option indicates correctly matched relationships?

A. 1-c, 2-d, 3-a, and 4-b
B. 1-a, 2-b, 3-c, and 4-d
C. 1-d, 2-b, 3-a, and 4-c
D. 1-c, 2-a, 3-b, and 4-d

Answer: D

NEW QUESTION # 254
View the exhibit and examine the description for the SALES and CHANNELS tables.

You issued this SQL statement:

Which statement is true regarding the result?

A. The statement will fail because a subquery cannot be used in a VALUES clause.
B. The statement will fail because the VALUES clause is not required with a subquery.
C. The statement will execute and a new row will be inserted in the SALES table.
D. The statement will fail because the subquery in the VALUES clause is not enclosed within single quotation marks.

Answer: C

NEW QUESTION # 255
Examine the description of the countries table:

Examine the description of the departments table:

Examine the description of the locations table:

Which two queries will return a list of countries with no departments?

Answer: A,D

Explanation:
The query's goal is to return a list of countries that have no departments linked to them.
Option B and Option D are the correct answers because they use set operations that will effectively return countries that do not have a corresponding entry in the departments table:
Option B uses the NOT IN subquery to exclude countries that have departments linked to them. It looks for country_id values in the countries table that are not present in the list of country_id values associated with locations that are, in turn, associated with departments. This will correctly return countries that have no departments.
Option D uses the MINUS set operator, which subtracts the results of the second SELECT statement from the results of the first. This statement will return all countries from the countries table minus those that have an associated department_id in the departments table, effectively listing countries with no departments.
Option A and Option C are incorrect because:
Option A will not execute successfully as it tries to join tables using a column (country_id) that doesn't exist in the departments table, which will lead to an error.
Option C's use of INTERSECT is incorrect for this requirement. INTERSECT returns only the rows that exist in both queries. Since we want countries with no departments, using INTERSECT would actually return the opposite of what is required.
Reference:
Oracle Documentation on NOT IN clause: SQL Language Reference - Subquery Oracle Documentation on MINUS operator: SQL Language Reference - Set Operators Therefore, the correct options are B and D, which use subquery exclusion and the MINUS set operator, respectively, to accurately identify and return countries without departments.

NEW QUESTION # 256
Which three statements are true reading subqueries? (Choose three.)

A. The subquery and main query must retrieve date from the same table.
B. The subquery and main query can retrieve data from different tables.
C. Multiple columns or expressions can be compared between the subquery and main query.
D. A Main query can have many subqueries.
E. Only one column or expression can be compared between the subquery and main query.
F. A subquery can have more than one main query.

Answer: B,C,D

Explanation:
Explanation/Reference:

NEW QUESTION # 257
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Prepare with Confidence Using ExamcollectionPass Oracle 1z0-071 Exam Questions

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Oracle Database SQL sure pass dumps & 1z0-071 actual training pdf

Oracle Database SQL Sample Questions (Q252-Q257):

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