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Oracle 1z0-071 certification exam is a test designed to evaluate a candidate's knowledge and skills in SQL programming for Oracle databases. 1z0-071 exam tests the candidate's ability to write queries, manipulate data, and manage database objects using SQL. Passing 1z0-071 Exam is a requirement for obtaining the Oracle Database SQL certification.

Oracle Database SQL Sample Questions (Q147-Q152):

NEW QUESTION # 147
Which three statements are true about performing DML operations on a view with no Instead of triggers defined?

A. Views cannot be used to query rows from an underlying table if the table has a PRIMARY KEY and the PRIMARY KEY columns are not referenced in the defining query of the view.
B. Views cannot be used to add rows to an underlying table if the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
C. Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCT keyword.
D. WITH CHECK clause has no effect when deleting rows from the underlying table through the view.
E. Delete statements can always be done on a table tough a view.
F. Insert statements can always be done on a table through a view.

Answer: B,C,E

Explanation:
When performing DML operations on a view without INSTEAD OF triggers:
* Option C: Views cannot be used to add rows to an underlying table if the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
* This is true because the view would not provide values for NOT NULL columns without defaults, leading to an error.
* Option D: Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCT keyword.
* Using DISTINCT in the view's defining query can make the view non-updatable, as it may aggregate multiple rows into one.
* Option E: Delete statements can always be done on a table through a view.
* Deletes through a view are typically unrestricted as long as the view does not involve aggregates, DISTINCT, or similar constructs that would logically preclude determining which underlying rows should be deleted.

NEW QUESTION # 148
Which three statements are true about Structured Query Language (SQL)? (Choose three.)

A. It is used to define encapsulation and polymorphism for a relational table.
B. It guarantees atomicity, consistency, isolation, and durability (ACID) features.
C. It is the only language that can be used for both relational and object-oriented databases.
D. It requires that data be contained in hierarchical data storage.
E. It best supports relational databases.
F. It provides independence for logical data structures being manipulated from the underlying physical data storage

Answer: B,E,F

Explanation:
https://docs.microsoft.com/en-us/sql/relational-databases/hierarchical-data-sql-server? view=sql-server-2017

NEW QUESTION # 149
View the Exhibit and examine PRODUCTSand ORDER_ITEMStables.

You executed the following query to display PRODUCT_NAMEand the number of times the product has been ordered:
SELECT p.product_name, i.item_cnt
FROM (SELECT product_id, COUNT (*) item_cnt
FROM order_items
GROUP BY product_id) i RIGHT OUTER JOIN products p
ON i.product_id = p.product_id;
What would happen when the above statement is executed?

A. The statement would not execute because inline views and outer joins cannot be used together.
B. The statement would not execute because the GROUP BYclause cannot be used in the inline.
C. The statement would not execute because the ITEM_CNTalias cannot be displayed in the outer query.
D. The statement would execute successfully to produce the required output.

Answer: D

NEW QUESTION # 150
Examine the description products table:

Examine the description of the new_projects table;

Which two queries execute successfully?

Answer: A,D

Explanation:
To determine which queries will execute successfully, we need to consider the compatibility of the column definitions and the structure of the SELECT statements:
Option A uses the MINUS set operator, which subtracts rows returned by the second SELECT statement from the rows returned by the first. For MINUS to work, the number and the order of columns and their data types must be the same in both queries. This query will not execute successfully because the second SELECT statement does not include all columns from the first SELECT statement, and the data types and sizes of PROD_ID do not match (CHAR(2) vs CHAR(4)).
Option B uses the UNION ALL set operator, which appends the results of the second SELECT statement to the results of the first. Unlike UNION, UNION ALL does not eliminate duplicate rows. This query will execute successfully because UNION ALL does not require the same data types or sizes, and the result will contain all columns from the first SELECT statement filled with NULL for non-matching columns from the second SELECT statement.
Option C uses the UNION set operator, which requires the same number of columns and compatible data types. This query will not execute successfully because PROD_NAME has different data types (CHAR(4) vs VARCHAR2(10)), and the result of a UNION must have the same number of columns with compatible data types in the two SELECT statements.
Option D uses the UNION set operator as well, but unlike Option C, it does not require a specific data type match because both SELECT statements include all columns and UNION is used (which will automatically handle type conversion where necessary). This query will execute successfully.
Option E uses the INTERSECT set operator, which requires the same number and order of columns and their data types to be identical or compatible. This query will not execute successfully because the data types and sizes of PROD_ID do not match (CHAR(2) vs CHAR(4)).
Reference:
Oracle Documentation on Set Operators: SQL Language Reference - Set Operators Oracle Documentation on Data Type Precedence: SQL Language Reference - Data Type Precedence In conclusion, only Option B and Option D will execute successfully because they adhere to the rules of the UNION ALL and UNION operators respectively, regarding column count and data type compatibility.

NEW QUESTION # 151
View the Exhibit and examine the description of the EMPLOYEES table.

Evaluate the following SQL statement:
SELECT first_name, employee_id, NEXT_DAY(ADD_MONTHS(hire_date, 6), 1) "Review" FROM employees; The query was written to retrieve the FIRST_NAME, EMPLOYEE_ID, and review date for employees. The review date is the firsts Monday after the completion of six months of the hiring. The NLS_TERRITORY parameter is set to AMERICA in the session.
Which statement is true regarding this query?

A. The query would execute to give the desired output.
B. The query would not execute because date functions cannot be nested.
C. The query would execute but the output would give review dates that are Sundays.
D. The query would not execute because the NEXT_DAY function accepts a string as argument.

Answer: C

NEW QUESTION # 152
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