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Oracle Database SQL Sample Questions (Q24-Q29):

NEW QUESTION # 24
The ORDERS table has a primary key constraint on the ORDER_ID column.
The ORDER_ITEMS table has a foreign key constraint on the ORDER_ID column, referencing the primary key of the ORDERS table.
The constraint is defined with on DELETE CASCADE.
There are rows in the ORDERS table with an ORDER_TOTAL less than 1000.
Which three DELETE statements execute successfully?

A. DELETE FROM orders;
B. DELETE * FROM orders WHERE order_total<1000;
C. DELETE order_id FROM orders WHERE order_total<1000;
D. DELETE orders WHERE order_total<1000;
E. DELETE FROM orders WHERE order_total<1000;

Answer: A,D,E

NEW QUESTION # 25
Examine the description of the EMPLOYEES table:

Examine this query:

Which line produces an error?

A. Line 7
B. Line 3
C. Line 8
D. Line 5

Answer: B

NEW QUESTION # 26
You own table DEPARTMENTS, referenced by views, indexes, and synonyms.
Examine this command which executes successfully:
DROP TABLE departments PURGE;
Which three statements are true?

A. It will drop all indexes on the DEPARTMENTS table.
B. Neither can it be rolled back nor can the DEPARTMENTS table be recovered.
C. It will delete all rows from the DEPARTMENTS table, but retain the empty table.
D. It will remove the DE PARTMENTS table from the database.
E. It will remove all synonyms for the DEPARTMENTS table.
F. It will remove all views that are based on the DEPARTMENTS table.

Answer: A,B,D

Explanation:
* A: This is true. Using PURGE in the DROP TABLE command will permanently remove the table and its dependent objects so that it cannot be recovered, and the action cannot be rolled back.
* B: This statement is true. Dropping the base table will result in the removal of all views that are based on the DEPARTMENTS table.
* C: This statement is false. The PURGE option removes the table and does not just delete rows.
* D: This statement is true. The DROP TABLE command will remove the DEPARTMENTS table from the database.
* E: This statement is true. When a table is dropped, all synonyms for that table are also removed.
* F: This statement is true. Dropping a table will automatically drop all indexes associated with the table.

NEW QUESTION # 27
The PRODUCTStable has the following structure.

Evaluate the following two SQL statements:
SQL>SELECT prod_id, NVL2 (prod_expiry_date, prod_expiry_date + 15, ' ') FROM products; SQL>SELECT prod_id, NVL (prod_expiry_date, prod_expiry_date + 15) FROM products; Which statement is true regarding the outcome?

A. Both the statements execute and give different results
B. Only the first SQL statement executes successfully
C. Only the second SQL statement executes successfully
D. Both the statements execute and give the same result

Answer: A

Explanation:
Using the NVL2 Function
The NVL2 function examines the first expression. If the first expression is not null, the NVL2 function returns the second expression. If the first expression is null, the third expression is returned.
Syntax
NVL2(expr1, expr2, expr3)
In the syntax:
Expr1 is the source value or expression that may contain a null
Expr2 is the value that is returned if expr1 is not null
Expr3 is the value that is returned if expr1 is null

NEW QUESTION # 28
Examine this business rule:
Each student can work on multiple projects and earth project can have multiple students.
You must decide an Entity Relationship (ER) model for optional data storage and allow generating reports in this format:
STUDENT_ID FIRST_NAME LAST_NAME PROJECT_ID PROJECT_NAME PROJECT_TASK Which two statements are true?

A. PROJECT_ID must be the primary key in the PROJECTS entity and foreign key in the STUDENTS entity.
B. An associative table must be created with a composite key of STUDENT_ID and PROJECT_ID, which is the foreign key linked to the STUDENTS and PROJECTS entities.
C. The ER must have a many-to-many relationship between the STUDENTS and PROJECTS entities that must be resolved into 1-to-many relationships.
D. The ER must have a 1-to-many relationship between the STUDENTS and PROJECTS entities.
E. STUDENT_ID must be the primary key in the STUDENTS entity and foreign key in the PROJECTS entity.

Answer: B,C

Explanation:
For the described business rule, the relationship between the students and projects entities is a many-to-many relationship, meaning that each student can be involved in multiple projects and each project can have multiple students.
* Statement A is true because to implement a many-to-many relationship in a relational database, an associative (junction) table is typically used. This table will contain the primary keys from both related entities as foreign keys in the associative table, making a composite primary key consisting of STUDENT_ID and PROJECT_ID. This setup allows the database to effectively manage the relationships between students and projects.
* Statement B is true as it accurately describes the solution to managing a many-to-many relationship. A direct many-to-many relationship cannot be physically implemented in a relational database. It is instead resolved into two 1-to-many relationships using an associative table as described in A. This is a fundamental relational database design principle aimed at normalizing the database and avoiding redundancy.
* Statements C, D, and E are incorrect as they misrepresent the nature of the relationships and key constraints necessary for this scenario. Specifically, C and E incorrectly suggest that one entity's primary key should serve as a foreign key in another, which does not align with the many-to-many relationship requirement described. Statement D incorrectly suggests a 1-to-many relationship directly between students and projects, which does not meet the business rule requirement.

NEW QUESTION # 29
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