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2021 May 1z0-047 Study Guide Questions:
Q91. View the Exhibit and examine the structure of the ORDERS table. Which task would require subqueries?
A. displaying the total order value for sales representatives 161 and 163
B. displaying the order total for sales representative 161 in the year 1999
C. displaying the number of orders that have order mode online and order date in 1999
D. displaying the number of orders whose order total is more than the average order total for all online orders
Answer: D
Q92. Which two statements are true regarding operators used with subqueries? (Choose two.
A. The NOT IN operator is equivalent to IS NULL
B. The <ANY operator means less than the maximum.
C. =ANY and =ALL operators have the same functionality.
D. The IN operator cannot be used in single-row subqueries.
E. TheNOT operator can be used with IN, ANY and ALL operators.
Answer: BE
Q93. Which three statements are true regarding single-row functions? (Choose three.)
A. They can accept only one argument.
B. They can be nested up to only two levels.
C. They can return multiple values of more than one data type.
D. They can be used in SELECT, WHERE, and ORDER BY clauses.
E. They can modify the data type of the argument that is referenced.
F. They can accept a column name, expression, variable name, or a user-supplied constant as arguments.
Answer: DEF
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Q94. Which three statements indicate the end of a transaction? (Choose three.)
A. after a COMMIT is issued
B. aftera ROLLBACK is issued
C. afteraSAVEPOINTis issued
D. afteraSELECT statement is issued
E. aftera CREATE statementis issued
Answer: ABE
Q95. View the Exhibit and examine the description of the DEPARTMENTS and EMPLOYEES tables.
To retrieve data for all the employees for their EMPLOYEE_ID, FIRST_NAME, and DEPARTMENT NAME, the following SQL statement was written:
SELECT employee_id, first_name, department_name
FROM employees NATURAL JOIN departments;
The desired output is not obtained after executing the above SQL statement. What could be the reason for this?
A. The NATURAL JOIN clause is missing the USING clause.
B. The table prefix is missing for the column names in the SELECT clause.
C. The DEPARTMENTS table is not used before the EMPLOYEES table in the FROM clause.
D. The EMPLOYEES and DEPARTMENTS tables have more than one column with the same column name and data type.
Answer: D
Q96. View the Exhibit and examine the structure of the ORDERS table.
You have to display ORDER_ID, ORDER_DATE, and CUSTOMER_ID for all those orders that were placed after the last order placed by the customer whose CUSTOMER_ID is 101
Which query would give you the desired output?
A. SELECT order_id, order_date FROM orders
WHERE order_date > ALL (SELECT MAX(order_date)
FROM orders) AND
Customer_id = 101;
B. SELECT order_id, order_date FROM orders
WHERE order_date > ANY (SELECT order_date
FROM orders
WHERE customer_id = 101);
C. SELECT order_id, order_date FROM orders
WHERE order_date > ALL (SELECT order_date
FROM orders
WHERE customer_id = 101);
D. SELECT order_id, order_date FROM orders
WHERE order_date IN (SELECT order_date
FROM orders
WHERE customer id = 101);
Answer: C
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Q97. View the Exhibit and examine the structure of EMPLOYEES and JOB_HISTORY tables.
The EMPLOYEES table maintains the most recent information regarding salary, department, and job for all the employees. The JOB_HISTORY table maintains the record for all the job changes for the employees. You want to delete all the records from the JOB_HISTORY table that are repeated in the EMPLOYEES table.
Which two SQL statements can you execute to accomplish the task? (Choose two.)
A. DELETE FROM job_history j WHERE employee_id = (SELECT employee_id FROM employees e WHERE j.employee_id = e.employee_id) AND job_id = (SELECT job_id FROM employees e WHERE j.job_id = e.job_id);
B. DELETE FROM job_history j WHERE (employee_id, job_id) = ALL (SELECT employee_id, job_id FROM employees e WHERE j.employee_id = e.employee_id and j.job_id = e.job_id)
C. DELETE FROM job_history j WHERE employee_id = (SELECT employee_id FROM employees e WHERE j.employee_id = e.employee_id and j.job_id = e.job_id)
D. DELETE FROM job_history j WHERE (employee_id, job_id) = (SELECT employee_id, job_id FROM employees e WHERE j.employee_id = e.employee_id and j.job_id = e.job_id)
Answer: CD
Q98. Evaluate the following SQL statement:
SELECT 2 col1,ycol2
FROM dual
UNION
SELECT 1 ,'x'
FROM dual
UNION
SELECT 3 .NULL
FROM dual
ORDER BY 2;
Which statement is true regarding the output of the SQL statement?
A. It would execute and the order of the values in the first column would be 3,2,1.
B. It would execute and the order of the values in the first column would be 1,2,3.
C. It would not execute because the column alias name has not been used in the ORDER BY clause.
D. It would not execute because the number 2 in the ORDER BY clause would conflict with the value 2 in the first SELECT statement.
Answer: B
Q99. View the Exhibit and examine the description of the EMPLOYEES table.
You want to calculate the total remuneration for each employee. Total remuneration is the sum of the annual salary and the percentage commission earned for a year. Only a few employees earn commission.
Which SOL statement would you execute to get the desired output?
A. SELECTfirst_name, salary, salary*12+salary*commission_pct "Total"
FROM EMPLOYEES;
B. SELECTfirst_name,salary, salary*12+NVL((salary*commission_pct), 0) "Total"
FROMEMPLOYEES;
C. SELECTfirst_name, salary, salary*12 + NVL(salary, O)*commission_pct "Total"
FROM EMPLOYEES;
D. SELECTfirst_name, salary, salary*12+(salary*NVL2(commission_pct,
salary,salary+commission_pct))"Total"
FROM EMPLOYEES;
Answer: B
Q100. The first DROP operation is performed on PRODUCTS table using the following command:
DROP TABLE products PURGE;
Then you performed the FLASHBACK operation by using the following command:
FLASHBACK TABLE products TO BEFORE DROP;
Which statement describes the outcome of the FLASHBACK command?
A. It recovers only thetablestructure.
B. It recovers thetablestructure,data,andtheindexes.
C. It recovers thetablestructure anddatabutnotthe related indexes.
D. It is not possible to recover the table structure, data, or the related indexes.
Answer: D