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100% Pass Quiz Oracle - Fantastic 1z1-071 - Exam Oracle Database SQL Vce Format

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Oracle Database SQL Sample Questions (Q123-Q128):

NEW QUESTION # 123
Which three statements are true about dropping and unused columns in an Oracle database?

A. An UNUSED column's space is remained automatically when the block containing that column is next queried.
B. Partition key columns cannot be dropped.
C. A column that is set to NNUSED still counts towards the limit of 1000 columns per table.
D. A DROP COLUMN command can be rolled back.
E. An UNUSED column's space is remained automatically when the row containing that column is next queried.
F. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.

Answer: B,C,D

Explanation:
A . A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option. (Incorrect) Primary key columns that are referenced by foreign keys cannot be dropped as it would violate referential integrity. The CASCADE option does not apply in this context.
B . A DROP COLUMN command can be rolled back. (Correct)
Dropping a column from a table is a transactional operation. If it's not committed, it can be rolled back.
Reference:
C . An UNUSED column's space is remained automatically when the block containing that column is next queried. (Incorrect) The space occupied by an UNUSED column is not automatically reclaimed in this way.
D . An UNUSED column's space is remained automatically when the row containing that column is next queried. (Incorrect) Similar to C, the space for an UNUSED column is not reclaimed automatically upon querying the row.
E . Partition key columns cannot be dropped. (Correct)
Partition key columns are integral to the partitioning strategy of a table and cannot be dropped.
F . A column that is set to UNUSED still counts towards the limit of 1000 columns per table. (Correct) Marking a column as UNUSED is a logical operation that prevents it from being used in future DML operations, but it still counts towards the column limit of the table until it is actually dropped from the table.

NEW QUESTION # 124
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?

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);
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);
C. 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);
D. 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);

Answer: C

NEW QUESTION # 125
View the exhibit for the structure of the STUDENTand FACULTYtables.
STUDENT
Name Null? Type
------------------ ------------------- -------------
STUDENT_ID NOT NULL NUMBER(2)
STUDENT_NAME VARCHAR2(20)
FACULTY_ID VARCHAR2(2)
LOCATION_ID NUMBER(2)
FACULTY
Name Null? Type
- ----------------- ------------------- -------------
FACULTY_ID NOT NULL NUMBER(2)
FACULTY_NAME VARCHAR2(20)
LOCATION_ID NUMBER(2)
You need to display the faculty name followed by the number of students handled by the faculty at the base location.
Examine the following two SQL statements:
Statement 1
SQL>SELECT faculty_name, COUNT(student_id)
FROM student JOIN faculty
USING (faculty_id, location_id)
GROUP BY faculty_name;
Statement 2
SQL>SELECT faculty_name, COUNT(student_id)
FROM student NATURAL JOIN faculty
GROUP BY faculty_name;
Which statement is true regarding the outcome?

A. Only statement 2 executes successfully and gives the required result.
B. Both statements 1 and 2 execute successfully and give the same required result.
C. Only statement 1 executes successfully and gives the required result.
D. Both statements 1 and 2 execute successfully and give different results.

Answer: C

NEW QUESTION # 126

Which three statements are true?

A. The DEPTNO column in the EMP table can contain the value 1.
B. An index is created automatically in the MANAGER column.
C. The COMMISSION column can contain negative values .
D. The MANAGER column is a foreign key referencing the EMPNO column.
E. The DEPTNO column in the EMP table can contain NULLS .
F. The DNAME column has a unique constraint.
G. The SALARY column must have a value .

Answer: A,B,E

NEW QUESTION # 127
View the Exhibit and examine the structure of the PRODUCT_INFORMATION and INVENTORIES tables.

You have a requirement from the supplies department to give a list containing PRODUCT_ID, SUPPLIER_ID, and QUANTITY_ON_HAND for all the products wherein QUANTITY_ON_HAND is less than five.
Which two SQL statements can accomplish the task? (Choose two.)

A. SELECT product_id, quantity_on_hand, supplier_idFROM
product_informationNATURAL JOIN inventories AND quantity_on_hand < 5;
B. SELECT i.product_id, i.quantity_on_hand, pi.supplier_idFROM product_information pi JOIN inventories iON (pi.product_id=i.product_id)USING (product_id) AND quantity_on_hand < 5;
C. SELECT i.product_id, i.quantity_on_hand, pi.supplier_idFROM product_information pi JOIN inventories iON (pi.product_id=i.product_id) AND quantity_on_hand < 5;
D. SELECT i.product_id, i.quantity_on_hand, pi.supplier_idFROM product_information pi JOIN inventories iON (pi.product_id=i.product_id)WHERE quantity_on_hand < 5;

Answer: C,D

NEW QUESTION # 128
......

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