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Oracle 1z1-071 Certification Exam consists of 73 multiple-choice questions, and the candidates have 105 minutes to complete the exam. 1z1-071 exam covers various topics, including data manipulation, data definition, data control, and transactions. 1z1-071 exam also covers SQL functions, expressions, and operators, as well as basic SQL programming concepts, such as joins, subqueries, and set operators.

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Oracle Database SQL Sample Questions (Q435-Q440):

NEW QUESTION # 435
Which two tasks require subqueries?

A. Display products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products, and whose status is orderable.
B. Display the minimum PROD_LIST_PRICE for each product status.
C. Display the total number of products supplied by supplier 102 which have a product status of obsolete.
D. Display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE.
E. Display suppliers whose PROD_LIST_PRICE is less than 1000.

Answer: A,D

Explanation:
C: True. To display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE, you would need to use a subquery to first calculate the average PROD_LIST_PRICE and then use that result to compare each product's list price to the average.
E: True. Displaying products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products and whose status is orderable would require a subquery. The subquery would be used to determine the average PROD_LIST_PRICE, and then this average would be used in the outer query to filter the products accordingly.
Subqueries are necessary when the computation of a value relies on an aggregate or a result that must be obtained separately from the main query, and cannot be derived in a single level of query execution.
Reference:
Oracle's SQL documentation provides guidelines for using subqueries in scenarios where an inner query's result is needed to complete the processing of an outer query.

NEW QUESTION # 436
Which statement will return a comma-separated list of employee names in alphabetical order for each department in the EMP table?

A. SELECT deptno,LISTAGG(ename, ', ') WITHIN GROUP AS employee_list FROM emp GROUP BY deptno ORDER BY ename;
B. SELECT deptno,LISTAGG(ename, ', ') WITHIN GROUP (ORDER BY ename) AS employee_list FROM emp GROUP BY deptno;
C. SELECT deptno,LISTAGG(ename, ' , ') WITHIN GROUP AS employee_list FROM emp GROUP BY deptno;
D. SELECT deptno,LISTAGG(ename, ', ') WITHIN GROUP (GROUP BY deptno) AS employee_list FROM emp ORDER BY ename;

Answer: B

Explanation:
The LISTAGG function is used in Oracle to aggregate strings from data in a group specified by the GROUP BY clause, producing a single row of concatenated values. The correct syntax also specifies an ORDER BY clause within the WITHIN GROUP parenthesis to sort the values in the concatenated list.
The correct query is:
SELECT deptno, LISTAGG(ename, ', ') WITHIN GROUP (ORDER BY ename) AS employee_list FROM emp GROUP BY deptno; This statement will return a comma-separated list of employee names (ename) in alphabetical order for each department (deptno) in the EMP table.

NEW QUESTION # 437
Examine the description of the PRODUCT_STATUS table:

The STATUS column contains the values 'IN STOCK' or 'OUT OF STOCK' for each row Which two queries will execute successfully?

A. SELECT prod_id || q's not available'' FROM product_status WHERE status='OUT OF STOCK';
B. SELECT prod_id "CURRENT AVAILABILITY" || q'('s not available)' FROM product_status WHERE status = 'OUT OF STOCK';
C. SELECT prod_id || q'('s not available)' 'CURRENT AVAILABILITY' FROM product_status WHERE status = 'OUT OF STOCK';
D. SELECT prod_id || q'('s not available)' "CURRENT AVAILABILITY" FROM product_status WHERE status = 'OUT OF STOCK';
E. SELECT prod_id || q'('s not available)' FROM product_status WHERE status = 'OUT OF STOCK';
F. SELECT prod_id || q"'s not available" FROM product_status WHERE status = 'OUT OF STOCK';

Answer: D,E

Explanation:
Queries that will execute successfully given the PRODUCT_STATUS table:
C . SELECT prod_id || q'('s not available)' "CURRENT AVAILABILITY" FROM product_status WHERE status = 'OUT OF STOCK'; This query will execute successfully because it uses the q quote operator correctly to handle the inclusion of single quotes in the string.
D . SELECT prod_id || q'('s not available)' FROM product_status WHERE status = 'OUT OF STOCK'; Similar to the previous query, it uses the q quote operator correctly and will execute without syntax errors.
Options A, B, E, and F are incorrect because of the incorrect or incomplete use of the quote operator:
A is incorrect because it has an additional single quote before the FROM clause.
B is incorrect because of a missing ending single quote after the q quote operator.
E and F are incorrect because they both use the q quote operator incorrectly; q'('s not available)' is not a valid use of the quote operator, and q"'s not available" incorrectly uses double quotes instead of single quotes.

NEW QUESTION # 438
Which two statements will return the names of the three employees with the lowest salaries?

A. SELECT last_name,salary
FROM (SELECT * FROM employees ORDER BY salary)
B. SELECT last_name,salary
FROM employees
WHERE ROWNUM<=3
ORDER BY (SELECT salary FROM employees);
C. SELECT last_name,salary
FROM employees
FETCH FIRST 3 ROWS ONLY
ORDER BY salary;
D. SELECT last_name,salary
FROM employees
ORDER BY salary
FETCH FIRST 3 ROWS ONLY;
E. SELECT last_name, salary
FROM employees
WHERE ROWNUM<=3

Answer: D

Explanation:
To retrieve the names of the three employees with the lowest salaries, the correct SQL syntax and logic are crucial:
Option B:
SELECT last_name, salary FROM employees ORDER BY salary FETCH FIRST 3 ROWS ONLY; This query correctly sorts employees by their salary in ascending order and fetches the first three rows only. The FETCH FIRST n ROWS ONLY syntax is a standard way to limit the result set in SQL.
Options A, C, D, and E do not correctly implement the logic for fetching the lowest three salaries due to misuse of ROWNUM or incorrect placement of ORDER BY and FETCH clauses.

NEW QUESTION # 439
View the exhibit and examine the structure in ORDERSand ORDER_ITEMStables.

You need to create a view that displays the ORDER_ID, ORDER_DATE, and the total number of items in each order.
Which CREATEVIEWstatement would create the views successfully?

A. CREATE OR REPLACE VIEW ord_vu
AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id) ||
"NO OF ITEMS"
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
WHITH CHECK OPTION;
B. CREATE OR REPLACE VIEW ord_vu
AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id)
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id, o.order_date;
C. CREATE OR REPLACE VIEW ord_vu (order_id, order_date)
AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id)
" NO OF ITEMS"
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id, o.order_date;
D. CREATE OR REPLACE VIEW ord_vu
AS SELECT o.order_id, o.order_date, COUNT (i.line_item_id)
" NO OF ITEMS"
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id, o.order_date;

Answer: D

NEW QUESTION # 440
......

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