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NEW QUESTION # 22
Examine this statement which returns the name of each employee and their manager:
You want to extend the query to include managers with no employees. What must you add before join to do this?
- A. RIGHT OUTER
- B. CROSS
- C. LEFT OUTER
- D. FULL. OUTER
Answer: A
NEW QUESTION # 23
View the Exhibit and examine the structure of the ORDERS table.
You must select ORDER_ID and ORDER_DATE for all orders that were placed after the last order placed by CUSTOMER_ID 101.
Which query would give you the desired result?
- A. SELECT order_id, order_date FROM orders
WHERE order_date > IN
(SELECT order_date FROM orders WHERE customer_id = 101); - B. SELECT order_id, order_date FROM orders
WHERE order_date > ALL
(SELECT MAX(order_date) FROM orders ) AND customer_id = 101; - C. SELECT order_id, order_date FROM orders
WHERE order_date >
ANY
(SELECT order_date FROM orders WHERE customer_id = 101); - D. SELECT order_id, order_date FROM orders
WHERE order_date > ALL
(SELECT order_date FROM orders WHERE customer_id = 101);
Answer: D
NEW QUESTION # 24
Examine this SQL statement
DELETE FROM employees e
WHERE EXISTS
(SELECT' dummy'
FROM emp history
WHERE employee_ id= e. employee id);
Which two are true?
- A. The DELETE statement executes successfully even if the subquery selects multiple rows.
- B. The subquery is executed before the DELETE statement is executed.
- C. The subquery is executed for every row in the EMPLOYEES table.
- D. All existing rows in the EMPLOYEES table are deleted,
- E. The subquery is not a correlated subquery.
Answer: A,B
Explanation:
For the provided DELETE statement with an EXISTS clause:
* Option B: The subquery is executed before the DELETE statement is executed.
* Subqueries with EXISTS are typically executed before the outer DELETE statement to determine which rows of the outer query satisfy the condition.
* Option D: The DELETE statement executes successfully even if the subquery selects multiple rows.
* The EXISTS condition is used to check for the existence of rows returned by the subquery, regardless of how many rows there are. It returns TRUE if the subquery returns at least one row.
Options A, C, and E are incorrect because:
* Option A: This statement is incorrect; the subquery is indeed a correlated subquery because it references the employee_id from the outer query (employees).
* Option C: This is incorrect because not all existing rows in the EMPLOYEES table will be deleted, only those for which an associated record exists in the emp_history table.
* Option E: While technically the subquery may be evaluated multiple times, it is only executed for those rows in EMPLOYEES that satisfy the condition of the EXISTS clause.
NEW QUESTION # 25
Which two statements are true about INTERVAL data types
- A. The value in an INTERVAL DAY TO SECOND column can be copied into an INTERVAL YEAR TO MONTH column.
- B. INTERVAL YEAR TO MONTH columns support yearly intervals.
- C. INTERVAL YEAR TO MONTH columns only support monthly intervals within a range of years.
- D. INTERVAL DAY TO SECOND columns support fractions of seconds.
- E. The YEAR field in an INTERVAL YEAR TO MONTH column must be a positive value.
- F. INTERVAL YEAR TO MONTH columns only support monthly intervals within a single year.
Answer: C,D
Explanation:
Regarding INTERVAL data types in Oracle Database 12c:
* A. INTERVAL YEAR TO MONTH columns only support monthly intervals within a range of years. This is true. The INTERVAL YEAR TO MONTH data type stores a period of time using years and months.
* E. INTERVAL DAY TO SECOND columns support fractions of seconds. This is true. The INTERVAL DAY TO SECOND data type can store days, hours, minutes, seconds, and fractional seconds.
Options B, C, D, and F are incorrect:
* B is incorrect because data types between INTERVAL DAY TO SECOND and INTERVAL YEAR TO MONTH are not compatible.
* C is incorrect as it incorrectly limits INTERVAL YEAR TO MONTH to a single year.
* D is incorrect; the YEAR field can be negative to represent a past interval.
* F is incorrect as INTERVAL YEAR TO MONTH supports intervals that can span multiple years, not just annual increments.
NEW QUESTION # 26
Which two statements are true about the results of using the intersect operator in compound queries?
- A. intersect returns rows common to both sides of the compound query.
- B. Column names in each select in the compound query can be different.
- C. Reversing the order of the intersected tables can sometimes affect the output.
- D. The number of columns in each select in the compound query can be different.
- E. intersect ignores nulls.
Answer: A,B
Explanation:
C). True, the names of the columns in each SELECT statement of an INTERSECT query do not need to match, as long as the data types and order of the columns correspond.D. True, the INTERSECT operator returns only the rows that are common to both SELECT statements, effectively acting as a set intersection of the results from both queries.
References:
* Oracle documentation on INTERSECT operator: Oracle Database SQL Language Reference
* Detailed behavior of INTERSECT: Oracle Compound Queries
NEW QUESTION # 27
Examine the description of the EMPLOYEES table:
Which statement will execute successfully, returning distinct employees with non-null first names?
- A. SELECT first_ name, DISTINCT last_ name FROM employees WHERE first_ name < > NULL;
- B. SELECT Distinct * FROM employees WHERE first_ name < > NULL;
- C. SELECT first_ name, DISTNCT last_ name FROM employees WHERE first_ name IS NOT NULL;
- D. SELECT DISTINCT * FROM employees WHERE first_ name IS NOT NULL;
Answer: D
NEW QUESTION # 28
Examine the data in the NEW_EMPLOYEES table:
Examine the data in the EMPLOYEES table:
You want to:
1. Update existing employee details in the EMPLOYEES table with data from the NEW EMPLOYEES table.
2. Add new employee detail from the NEW_ EMPLOYEES able to the EMPLOYEES table.
Which statement will do this:
- A. MERGE INTO employees e
USING new employees ne
WHERE e.employee_id = ne.employee_ id
WHEN MATCHED THEN
UPDATE SET e.name = ne.name, e.job_id = ne.job_id,e.salary =ne. salary
WHEN NOT MATCHED THEN
INSERT VALUES (ne. employee_id,ne.name, ne.job_id,ne.salary) ; - B. MERGE INTO employees e
USING new employees ne
ON (e.employee_id = ne.employee_id)
WHEN FOUND THEN
UPDATE SET e.name =ne.name, e.job_id=ne.job_id, e.salary =ne.salary
WHEN NOT FOUND THEN
INSERT VALUES (ne.employee_id,ne.name,ne.job_id,ne.salary) ; - C. MERGE INTO employees e
USING new_employees n
ON (e.employee_id = ne.employee_id)
WHEN MATCHED THEN
UPDATE SET e.name = ne.name, e.job id = ne.job_id,e.salary =ne. salary
WHEN NOT MATCHED THEN
INSERT VALUES (ne. employee_id,ne.name,ne.job_id,ne.salary); - D. MERGE INTO employees e
USING new_employees n
WHERE e.employee_id = ne.employee_id
WHEN FOUND THEN
UPDATE SET e.name=ne.name,e.job_id =ne.job_id, e.salary=ne.salary
WHEN NOT FOUND THEN
INSERT VALUES (ne.employee_ id,ne.name,ne.job id,ne.salary) ;
Answer: C
NEW QUESTION # 29
Which two statements are true about single row functions?
- A. CEIL: can be used for positive and negative numbers
- B. FLOOR: returns the smallest integer greater than or equal to a specified number
- C. MOD: returns the quotient of a division operation
- D. TRUNC: can be used with NUMBER and DATE values
- E. CONCAT: can be used to combine any number of values
Answer: A,D
Explanation:
Single-row functions operate on single rows and return one result per row. Let's look at each option in the context of Oracle 12c SQL:
* A. CONCAT: This function can only combine two values at a time. If you need to concatenate more than two values, you have to nest CONCAT functions or use the || operator.
* B. MOD: The MOD function returns the remainder of a division operation, not the quotient.
* C. CEIL: This function returns the smallest integer that is greater than or equal to a specified number. It works with both positive and negative numbers.
* D. FLOOR: It returns the largest integer that is less than or equal to the specified number, not greater than or equal to.
* E. TRUNC: This function can indeed be used with both NUMBER and DATE values to truncate them to a specified number of decimal places or to a particular component of a date.
References:
* Oracle Database SQL Language Reference 12c Release 1 (12.1), Functions
* Oracle Database SQL Language Reference 12c Release 1 (12.1), CONCAT Function
* Oracle Database SQL Language Reference 12c Release 1 (12.1), MOD Function
* Oracle Database SQL Language Reference 12c Release 1 (12.1), CEIL and FLOOR Functions
* Oracle Database SQL Language Reference 12c Release 1 (12.1), TRUNC Function
NEW QUESTION # 30
Examine this SQL statement:
Which two are true?
- A. The subquery is executed before the DELETE statement is executed.
- B. The subquery is executed for every row in the employees table.
- C. All existing rows in the EMPLOYEES table are deleted.
- D. The DELETE statement executes successfully even if the subquery selects multiple rows.
- E. The subquery is not a correlated subquery.
Answer: A,B
NEW QUESTION # 31
The SALES table has columns PROD_IDand QUANTITY_SOLDof data type NUMBER.
Which two queries execute successfully? (Choose two.)
- A. prod_id;
SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP - B. SELECT prod_id FROM sales WHERE quantity_sold > 55000 GROUP BY prod_id HAVING
- C. BY COUNT(*) >10;
SELECT COUNT(prod_id) FROM sales GROUP BY prod_id WHERE quantity_sold > 55000; - D. BY prod_id HAVING COUNT(*) >10;
SELECT COUNT (prod_id) FROM sales WHERE quantity_sold > 55000 GROUP BY - E. COUNT(*) >10;
SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP
Answer: B,D
NEW QUESTION # 32
View the Exhibit and examine the data in the EMPLOYEES table.
Exhibit
You want to generate a report showing the total compensation paid to each employee to date.
You issue the following query:
What is the outcome?
- A. It generates an error because the alias is not valid.
- B. IT executes successfully and gives the correct output.
- C. It generates an error because the usage of the ROUND function in the expression is not valid.
- D. It generates an error because the concatenation operator can be used to combine only two items.
- E. It executes successfully but does not give the correct output.
Answer: E
NEW QUESTION # 33
Examine the data in the CUST_NAME column of the CUSTOMERS table.
You want to extract only those customer names that have three names and display the * symbol in place of the first name as follows:
Which two queries give the required output?
- A. SELECT LPAD(SUBSTR(cust_name, INSTR (cust_name ' ')),LENGTH(cust_name) - INSTR(cust_name, ' '), '*') "CUST NAME"FROM customersWHERE INSTR(cust_name, ' ',1,2)<>0;
- B. SELECT LPAD(SUBSTR(cust_name, INSTR(cust_name, ' ')),LENGTH(cust_name),'*') "CUST NAME"FROM customersWHERE INSTR(cust_name, ' ',1,2)<>0;
- C. SELECT LPAD(SUBSTR(cust_name, INSTR (cust_name ' ')),LENGTH(cust_name) - INSTR(cust_name, ' '), '*') "CUST NAME"FROM customersWHERE INSTR(cust_name, ' ',1,-2)<>0;
- D. SELECT LPAD(SUBSTR(cust_name, INSTR(cust_name, ' ')),LENGTH(cust_name),'*') "CUST NAME"FROM customersWHERE INSTR(cust_name, ' ',-1,2)<>0;
Answer: B,D
NEW QUESTION # 34
Which three are true about the MERGE statement?
- A. It can use subqueries to produce source rows.
- B. It can combine rows from multiple tables conditionally to insert into a single table.
- C. It can use views to produce source rows.
- D. It can merge rows only from tables.
- E. It can update, insert, or delete rows conditionally in multiple tables.
- F. It can update the same row of the target table multiple times.
Answer: A,B,C
NEW QUESTION # 35
Examine the description of the CUSTOMERStable:
You need to display last names and credit limits of all customers whose last name starts with A or B in lower or upper case, and whose credit limit is below 1000.
Examine this partial query:
Which two WHEREconditions give the required result? (Choose two.)
- A.
- B.
- C.
- D.
- E.
Answer: B,C
NEW QUESTION # 36
Examine the description of the ORDERStable:
Examine the description of the INVOICEStable:
Examine this query:
Which three rows will it return? (Choose three.)
- A. 5 <null>
- B. 3 <null>
- C. 2 <null>
- D. 4 01-FEB-2019
- E. 3 01-JAN-2019
- F. 5 01-MAR-2019
- G. 1 <null>
Answer: C,E,F
NEW QUESTION # 37
Which statement adds a column called SALARYto the EMPLOYEEStable having 100 rows, which cannot contain null?
ALTER TABLE EMPLOYEES
- A. ADD SALARY NUMBER(8,2) DEFAULT NOT NULL;
ALTER TABLE EMPLOYEES - B. ADD SALARY NUMBER(8,2) DEFAULT CONSTRAINT p_nn NOT NULL;
ALTER TABLE EMPLOYEES - C. ADD SALARY NUMBER(8,2) NOT NULL;
- D. ADD SALARY NUMBER(8,2) DEFAULT 0 NOT NULL;
ALTER TABLE EMPLOYEES
Answer: A
NEW QUESTION # 38
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