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NEW QUESTION # 39
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 # 40
Which two statements are true about Oracle databases and SQL?
- A. A query can access only tables within the same schema.
- B. Updates performed by a database user can be rolled back by another user by using the ROLLBACK command.
- C. The database guarantees read consistency at select level on user-created tablers.
- D. When you execute an UPDATE statement, the database instance locks each updated row.
- E. A user can be the owner of multiple schemas In the same database.
Answer: C,D
Explanation:
B). True. Oracle databases guarantee read consistency at the transaction level, meaning that each query can only see data that has been committed before the query began executing.
C). True. When an UPDATE statement is executed, Oracle locks each row as it is updated to prevent other transactions from modifying it until the transaction is committed or rolled back.
A is incorrect because updates made by one user cannot be rolled back by another user. D is incorrect because a query can access tables in other schemas if proper permissions are granted. E is incorrect because a user can own only one schema, which has the same name as the user in an Oracle database.
NEW QUESTION # 41
Examine this SQL statement:
SELECT cust_id, cus_last_name "Last Name"
FROM customers
WHERE country_id = 10
UNION
SELECT cust_id CUST_NO, cust_last_name
FROM customers
WHERE country_id = 30
Identify three ORDER BY clauses, any one of which can complete the query successfully.
- A. ORDERBY 2, 1
- B. ORDER BY CUST_NO
- C. ORDER BY "Last Name"
- D. ORDER BY "CUST_NO"
- E. ORDER BY 2,cust_id
Answer: A,C
Explanation:
In SQL, the ORDER BY clause can refer to columns by their alias defined in the SELECT clause or by their positional number in the SELECT list. It's important to understand that after a UNION, the column names in the ORDER BY clause refer to the first SELECT statement's column names and aliases:
* Option A: ORDER BY 2, 1This is correct because it refers to the second and first columns in the first SELECT clause, which correspond to the aliases "Last Name" and cust_id, respectively.
* Option E: ORDER BY "Last Name"This is correct because "Last Name" is a valid alias defined in the first SELECT clause.
The other options fail for the following reasons:
* Option B: "CUST_NO" is not recognized in the ORDER BY clause because it's not an alias used in the first SELECT statement.
* Option C: Incorrect because 2, cust_id mixes positional reference with a column name that doesn't apply to both SELECT statements consistently.
* Option D: ORDER BY CUST_NO fails because CUST_NO is not an alias in the first SELECT clause.
NEW QUESTION # 42
Which three statements are true about indexes and their administration in an Oracle database?
- A. A descending index is a type of function-based index
- B. If a query filters on an indexed column then it will always be used during execution of the query
- C. A DROP INDEX statement always prevents updates to the table during the drop operation
- D. An INVISIBLE index is not maintained when Data Manipulation Language (DML) is performed on its underlying table.
- E. An index can be created as part of a CREATE TABLE statement.
- F. A UNIQUE and non-unique index can be created on the same table column
Answer: A,E,F
Explanation:
A). This statement is incorrect. An INVISIBLE index is maintained during DML operations just like a VISIBLE index. The difference is that an INVISIBLE index is not used by the optimizer unless explicitly hinted. B. This statement is correct. When creating a table, you can define indexes on one or more columns as part of the table definition. C. This statement is incorrect. While a DROP INDEX statement will drop the index, it does not always prevent updates to the table. If the index is marked as unusable or is an invisible index, for example, updates can still be performed. D. This statement is correct. It is possible to have both a UNIQUE index and a non-unique index on the same column. The UNIQUE index enforces the uniqueness of column values, while the non-unique index does not. E. This statement is correct to some extent. Descending indexes are not function-based indexes per se, but they are indexes on which the data is sorted in descending order, as opposed to the default ascending order. However, descending indexes are conceptually related to function-based indexes because they alter the way the indexed data is stored. F. This statement is incorrect.
The use of an index in query execution depends on the optimizer's decision, which is based on statistics and the cost associated with using the index. There are situations where the optimizer may choose a full table scan even if there is an index on the filter column.
References can be found in the Oracle Database Concepts Guide and the SQL Language Reference documentation, which detail the behavior of indexes and how they are managed within the Oracle database.
NEW QUESTION # 43
View the Exhibit and examine the structure of the ORDERStable.
Which UPDATE statement is valid?
UPDATE orders
- A. SET order_date = ’12-mar-2007’,
order_total = NULL
WHERE order_id = 2455;
UPDATE orders - B. SET order_date = TO_DATE(’12-mar-2007’,’dd-mon-yyyy’),
SET order_total = TO_NUMBER (NULL)
WHERE order_id = 2455; - C. SET order_date = ’12-mar-2007’,
order_total IS NULL
WHERE order_id = 2455;
UPDATE orders - D. SET order_date = ’12-mar-2007’,
AND order_total = TO_NUMBER(NULL)
WHERE order_id = 2455;
UPDATE orders
Answer: A
NEW QUESTION # 44
View the exhibit and examine the ORDERS table.
ORDERS
Name
Null?
Type
ORDER ID
NOT NULL
NUMBER(4)
ORDATE DATE
DATE
CUSTOMER ID
NUMBER(3)
ORDER TOTAL
NUMBER(7,2)
The ORDERS table contains data and all orders have been assigned a customer ID. Which statement would add a NOT NULL constraint to the CUSTOMER_ID column?
- A. ALTER TABLE ordersADD CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);
- B. ALTER TABLE ordersADD customer_id NUMBER(6)CONSTRAINT orders_cust_id_nn NOT NULL;
- C. ALTER TABLE ordersMODIFY CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);
- D. ALTER TABLE ordersMODIFY customer_id CONSTRAINT orders_cust_nn NOT NULL (customer_id);
Answer: D
NEW QUESTION # 45
Which two are true about dropping columns from a table?
- A. A column can be removed only if it contains no data.
- B. Multiple columns can be dropped simultaneously using the ALTER TABLE command.
- C. A column drop is implicitly committed.
- D. A primary key column cannot be dropped.
- E. A column must be set as unused before it is dropped from a table.
- F. A column that is referenced by another column in any other table cannot be dropped.
Answer: B,C,F
NEW QUESTION # 46
Which two are true about the WITH GRANT OPTION clause?
- A. The grantee must have the GRANT ANY OBJECT PRIVILEGE system prvilege to use this option.
- B. It can be used for system and object privileges.
- C. It cannot be used to pass on privileges to PUBLIC by the grantee.
- D. It can be used when granting privileges to roles.
- E. The grantee can grant the object privilege to any user in the database, with of without including this option.
- F. It can be used to pass on privileges to other users by the grantee.
Answer: E,F
NEW QUESTION # 47
Examine this query which executes successfully;
Select job,deptno from emp
Union all
Select job,deptno from jobs_history;
What will be the result?
- A. It will return rows both select statements including duplicate rows.
- B. It will return rows that are not common to both select statements.
- C. It will return rows common to both select statements.
- D. It will return rows from both select statements after eliminating duplicate rows.
Answer: A
NEW QUESTION # 48
Examine the description of the BOOKS_TRANSACTIONS table:
Which two WHERE conditions give the same result?
- A. WHERE borrowed_date = SYSDATE AND transaction_type ='RM' OR member_id IN ('A101','A102');
- B. WHERE borrowed_date = SYSDATE AND (transaction_type ='RM' AND (member_id ='A101' OR member_id ='A102') );
- C. WHERE (borrowed_date = SYSDATE AND transaction_type ='RM') OR member_id IN ('A101','A102');
- D. WHERE borrowed_date = SYSDATE AND (transaction_type ='RM' OR member_id IN ('A101','A102'));
- E. WHERE borrowed_date = SYSDATE AND (transaction_type ='RM' AND member_id='A101' OR member_id ='A102'));
Answer: A,C
NEW QUESTION # 49
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 table prefix is missing for the column names in the SELECT clause.
- B. The DEPARTMENTS table is not used before the EMPLOYEES table in the FROM clause.
- C. The NATURAL JOIN clause is missing the USING clause.
- D. The EMPLOYEES and DEPARTMENTS tables have more than one column with the same column name and data type.
Answer: D
NEW QUESTION # 50
View the exhibit and examine the description of the EMPLOYEES table. (Choose two.)
You executed this SQL statement:
SELECT first_name, department_id, salary
FROM employees
ORDER BY department_id, first_name, salary desc;
Which two statements are true regarding the result? (Choose two.)
- A. The values in the FIRST_NAME column would be returned in descending order for all employees having the same value in the DEPARTMENT_ID column.
- B. The values in the SALARY column would be returned in descending order for all employees having the same value in the DEPARTMENT_ID column.
- C. The values in the FIRST_NAME column would be returned in ascending order for all employees having the same value in the DEPARTMENT_ID column.
- D. The values in the all columns would be returned in descending order.
- E. The values in the SALARY column would be returned in descending order for all employees having the same value in the DEPARTMENT_ID and FIRST_NAME column.
Answer: C,E
NEW QUESTION # 51
SCOTTis a user in the database.
Evaluate the commands issued by the DBA:
Which statement is true regarding the execution of the above commands?
- A. Statement 2 would not execute because system privileges and object privileges cannot be granted together in a single GRANTcommand.
- B. Statement 1 would not execute because the IDENTIFIED BY <password>clause is missing.
- C. Statement 3 would not execute because role and system privileges cannot be granted together in a single GRANTstatement.
- D. Statement 1 would not execute because the WITH GRANToption is missing.
Answer: A
NEW QUESTION # 52
Which two statements are true regarding constraints? (Choose two.)
- A. A constraint is enforced only for the INSERT operation on a table.
- B. All the constraints can be defined at the column level as well as the table level
- C. A constraint can be disabled even if the constraint column contains data.
- D. A column with the UNIQUE constraint can contain NULL.
- E. A foreign key cannot contain NULL values.
Answer: C,D
NEW QUESTION # 53
View the Exhibit and examine the details of the PRODUCT_INFORMATION table.
Evaluate this SQL statement:
SELECT TO_CHAR (list_price, '$9,999')
From product_information;
Which two statements are true regarding the output? (Choose two.)
- A. A row whose LIST_PRICE column contains value 1123.90 would be displayed as $1,123.
- B. A row whose LIST_PRICE column contains value 11235.90 would be displayed as $1,123.
- C. A row whose LIST_PRICE column contains value 11235.90 would be displayed as #######.
- D. A row whose LIST_PRICE column contains value 1123.90 would be displayed as $1,124.
Answer: C,D
NEW QUESTION # 54
View the Exhibit and examine the description of the ORDERS table.
Which two WHERE clause conditions demonstrate the correct usage of conversion functions? (Choose two.)
- A. WHERE order_date > TO_CHAR(ADD_MONTHS(SYSDATE,6),'MON DD YYYY')
- B. WHERE order_date_IN ( TO_DATE('OCT 21 2003','MON DD YYYY'), TO_CHAR('NOV 21
2003','MON DD YYYY') ) - C. WHERE order_date > TO_DATE('JUL 10 2006','MON DD YYYY')
- D. WHERE TO_CHAR(order_date,'MON DD YYYY') = 'JAN 20 2003'
Answer: C,D
NEW QUESTION # 55
which three statements are true regarding single row subqueries?
- A. they must be placed on the left side of the comparison operator or condition.
- B. THEY MUST BE PLACED ON THE RIGHT SIDE OF THE COMPARISON OPERATOR OR
CONDITION. - C. they must return a row to prevent errors in the SQL statement.
- D. THEY CAN BE USED in the where clause.
- E. THEY CAN BE USED IN THE HAVING CLAUSE
- F. A SQL STATEMENT MAY HAVE MULTIPLE SINGLE ROW SUBQUERY BLOCKS.
Answer: D,E,F
NEW QUESTION # 56
Examine the data in the CUST_NAMEcolumn of the CUSTOMERStable.
CUST_NAME
-------------------
Renske Ladwig
Jason Mallin
Samuel McCain
Allan MCEwen
Irene Mikilineni
Julia Nayer
You need to display customers' second names where the second name starts with "Mc" or "MC".
Which query gives the required output?
- A. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)
FROM customers
WHERE INITCAP (SUBSTR(cust_name, INSTR (cust_name, ' ')+1))
LIKE 'Mc%'; - B. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)
FROM customers
WHERE INITCAP (SUBSTR(cust_name, INSTR (cust_name, ' ')+1))
'Mc'; - C. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)
FROM customers
WHERE SUBSTR (cust_name, INSTR (cust_name, ' ')+1)
LIKE INITCAP ('MC%'); - D. SELECT SUBSTR (cust_name, INSTR (cust_name, ' ')+1)
FROM customers
WHERE INITCAP (SUBSTR(cust_name, INSTR (cust_name, ' ')+1))
INITCAP 'MC%';
Answer: A
NEW QUESTION # 57
View the Exhibit and examine the structure of the ORDERStable. The columns ORDER_MODEand ORDER_TOTALhave the default values 'direct'and 0respectively.
Which two INSERTstatements are valid? (Choose two.)
INSERT INTO orders
- A. VALUES (1,'09-mar-2007', 'online','', 1000);
INSERT INTO orders - B. (order_id,order_date,order_mode,
(customer_id,order_total)
VALUES (1,TO_DATE(NULL), 'online', 101, NULL);
INSERT INTO - C. VALUES (1,'09-mar-2007', DEFAULT, 101, DEFAULT);
INSERT INTO orders - D. (SELECT order_id,order_date,customer_id
FROM orders)
VALUES (1,'09-mar-2007', 101);
INSERT INTO orders - E. (order_id,order_date,order_mode,order_total)
VALUES (1,'10-mar-2007','online',1000);
Answer: C,D
NEW QUESTION # 58
SCOTTis a user in the database.
Evaluate the commands issued by the DBA:
Which statement is true regarding the execution of the above commands?
- A. Statement 2 would not execute because system privileges and object privileges cannot be granted together in a single GRANTcommand.
- B. Statement 1 would not execute because the IDENTIFIED BY <password>clause is missing.
- C. Statement 3 would not execute because role and system privileges cannot be granted together in a single GRANTstatement.
- D. Statement 1 would not execute because the WITH GRANToption is missing.
Answer: A
Explanation:
Explanation/Reference:
NEW QUESTION # 59
View the Exhibit and examine the structure of the CUSTOMERS and CUST_HISTORY tables.
The CUSTOMERS table contains the current location of all currently active customers.
The CUST_HISTORY table stores historical details relating to any changes in the location of all current as well as previous customers who are no longer active with the company.
You need to find those customers who have never changed their address.
Which SET operator would you use to get the required output?
- A. UNION ALL
- B. UNION
- C. MINUS
- D. INTERSECT
Answer: C
NEW QUESTION # 60
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