1Z0-071 Free Practice Test

View the exhibit and examine the data in the PROJ_TASK_DETAILS table. (Choose the best answer.)

The PROJ_TASK_DETAILS table stores information about project tasks and the relation between them. The BASED_ON column indicates dependencies between tasks.
Some tasks do not depend on the completion of other tasks.
You must generate a report listing all task IDs, the task ID of any task upon which it depends and the name of the employee in charge of the task upon which it depends.
Which query would give the required result?

1. A. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p JOIN proj_task_details dON (p.task_id = d.task_id);
2. B. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p FULL OUTER JOIN proj_task_details dON (p.based_on = d.task_id);
3. C. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p JOIN proj_task_details dON (p.based_on = d.task_id);
4. D. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p LEFT OUTER JOIN proj_task_details dON (p.based_on = d.task_id);

Correct Answer: D

Examine the structure of the ORDERS table: (Choose the best answer.)

You want to find the total value of all the orders for each year and issue this command:
SQL> SELECT TO_CHAR(order_date,'rr'), SUM(order_total) FROM orders GROUP BY TO_CHAR(order_date, 'yyyy');
Which statement is true regarding the result?

1. A. It executes successfully but does not give the correct output.
2. B. It executes successfully but gives the correct output.
3. C. It returns an error because the TO_CHAR function is not valid.
4. D. It return an error because the datatype conversion in the SELECT list does not match the data type conversion in the GROUP BY clause.

Correct Answer: D

You need to produce a report where each customer’s credit limit has been incremented by $1000. In the output, the customer’s last name should have the heading Name and the incremented credit limit should be labeled New Credit Limit. The column headings should have only the first letter of each word in uppercase.
Which statement would accomplish this requirement?

1. A. SELECT cust_last_name AS “Name”, cust_credit_limit + 1000AS “New Credit Limit”FROM customers;
2. B. SELECT cust_last_name AS Name, cust_credit_limit + 1000AS New Credit LimitFROM customers;
3. C. SELECT cust_last_name AS Name, cust_credit_limit + 1000“New Credit Limit”FROM customers;
4. D. SELECT INITCAP (cust_last_name) “Name”, cust_credit_limit + 1000INITCAP (“NEW CREDIT LIMIT”)FROM customers;

Correct Answer: A

Which two statements are true regarding constraints?

1. A. A foreign key column cannot contain null values.
2. B. A column with the UNIQUE constraint can contain null values.
3. C. A constraint is enforced only for INSERT operation on the table.
4. D. A constraint can be disabled even if the constraint column contains data.
5. E. All constraints can be defined at the column level and at the table level.

Correct Answer: BD

You issued the following command: SQL> DROP TABLE employees; Which three statements are true?

1. A. All uncommitted transactions are committed.
2. B. All indexes and constraints defined on the table being dropped are also dropped.
3. C. Sequences used in the employees table become invalid.
4. D. The space used by the employees table is reclaimed immediately.
5. E. The employees table can be recovered using the rollback command.
6. F. The employees table is moved to the recycle bin

Correct Answer: ABF