最有效的1z0-071測試引擎，免費下載1z0-071考試資料得到妳想要的Oracle證書

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最新的 Oracle PL/SQL Developer Certified Associate 1z0-071 免費考試真題 (Q323-Q328):

問題 #323
Refer to the exhibit.

Which two queries execute successfully?

A. SELECT prod_id, prod_name FROM products
INTERSECT
SELECT 100, prod_name FROM newproducts;
B. SELECT prod_id, exp_date FROM products
UNION ALL
SELECT prod_id, NULL FROM new_products;
C. SELECT prod_id FROM products
UNION ALL
SELECT prod_id, prod_name FROM new_products;
D. SELECT * FROM products
UNION
SELECT * FROM new_products;
E. SELECT k FROM products
MINUS
SELECT prod_id FROM new_products;

答案：B,D

問題 #324
Examine the description or the CUSTOMERS table:

For Customers whose income level has a value, you want to display the first name and due amount as 5% of their credit limit. Customers whose due amount is null should not be displayed.
Which query should be used?

A. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level != NULL AND cust_credit_level != NULL;
B. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level IS NOT NULL AND due_amount IS NOT NULL;
C. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level <> NULL AND due_amount <> NULL;
D. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level IS NOT NULL AND cust_credit_limit IS NOT NULL;
E. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMONT FROM customers WHERE cust_income_level != NULL AND due_amount != NULL;

答案：D

解題說明：
In Oracle SQL, the correct way to check for non-null values is to use the IS NOT NULL condition. Using != NULL or <> NULL is incorrect because NULL represents the absence of any value, and you cannot use equality or inequality operators to check for NULL.
* C. SELECT cust_first_name, cust_credit_limit * .05 AS DUE_AMOUNT FROM customers WHERE cust_income_level IS NOT NULL AND cust_credit_limit IS NOT NULL; This query will correctly filter out any customers with a NULL income level or credit limit and then calculate the due amount as 5% of their credit limit for the remaining customers.
References:
* Oracle Database SQL Language Reference 12c, especially sections on conditions and expressions that deal with NULL values.

問題 #325
View the exhibit and examine the structure of the EMPLOYEES table.

You want to select all employees having 100 as their MANAGER_ID manages and their manager.
You want the output in two columns: the first column should have the employee's manager's LAST_NAME and the second column should have the employee's LAST_NAME.
Which SQL statement would you execute?

A. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eON m.employee_id = e.manager_idWHERE m.manager_id=100;
B. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eON e.employee_id = m.manager_idWHERE m.manager_id=100;
C. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eON m.employee_id = e.manager_idWHERE e.manager_id=100;
D. SELECT m.last_name "Manager", e.last_name "Employee"FROM employees m JOIN employees eWHERE m.employee_id = e.manager_id AND e.manager_id=100

答案：C

問題 #326
Which three statements are true about GLOBAL TEMPORARY TABLES?

A. A GLOBAL TEMPORARY TABLE can have multiple indexes.
B. Data Manipulation Language (DML) on GLOBAL TEMPORARY TABLES generates no REDO.
C. A GLOBAL TEMPORARY TABLE can be referenced in the defining query of a view.
D. A GLOBAL TEMPORARY TABLE can have only one index.
E. A GLOBAL TEMPORARY TABLE cannot have a PUBLIC SYNONYM.
F. A trigger can be created on a GLOBAL TEMPORARY TABLE.

答案：B,C,F

問題 #327
Which three statements are true about multiple row subqueries? (Choose three.)

A. Two or more values are always returned from the subquery.
B. They can return multiple columns.
C. They can contain HAVINGclauses.
D. They cannot contain a subquery.
E. They can contain GROUP BY clauses.

答案：A,B,E

解題說明：
Explanation/Reference: https://www.w3resource.com/sql/subqueries/multiplee-row-column-subqueries.php

問題 #328
......

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最有效的1z0-071測試引擎，免費下載1z0-071考試資料得到妳想要的Oracle證書

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1z0-071真題 & 1z0-071考證

最新的 Oracle PL/SQL Developer Certified Associate 1z0-071 免費考試真題 (Q323-Q328):

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