Section 9 Quiz Database Design Oracle

Section 9 Quiz

            (Answer all questions in this section)

1.         When translating an arc relationship to a physical design, you must turn the arc relationships into foreign keys. What additional step must you take with the created foreign keys to ensure the exclusivity principle of arc relationships? (Assume that you are implementing an Exclusive Design) (Choose Two)     Mark for Review

(1) Points

                                    (Choose all correct answers)  

            Make all relationships mandatory

            Make all relationships optional (*)

            Create an additional check constraint to verify that one foreign key is populated and the others are not (*)

            All the above

2.         Which of the following is a valid reason for considering a Subtype Implementation?          Mark for Review

(1) Points

            The common access paths for the supertypes are different.

            The resulting table will reside in a single database and be used by just ONE user.

            Business functionality, business rules, access paths, and frequency of access are all very different between the subtypes. (*)

            Most of the relationships are at the supertype level.

3.         When mapping supertypes, relationships at the supertype level transform as usual. Relationships at subtype level are implemented as foreign keys, but the foreign key columns all become mandatory. True or False?  Mark for Review

(1) Points

            True

            False (*)

4.         In an Oracle database, why would 1_TABLE not work as a table name?     Mark for Review

(1) Points

            The database does not understand all capital letters.

            TABLE is a reserved word.

            There is no problem here. You can create a table called 1_TABLE.

            Object names must not start with a number. They must begin with a letter. (*)

5.         In an Oracle database, why would the following table name not be allowed 'EMPLOYEE JOBS'?            Mark for Review

(1) Points

            The database does not understand all capital letters

            JOBS is a reserved word

            EMPLOYEE is a reserved word

            You cannot have spaces between words in a table name (*)

6.         Why would this table name NOT work in an Oracle database? this_year_end+next_year   Mark for Review

(1) Points

            Table names must begin with an alphabetic character.

            It is too long.

            The Plus sign + is not allowed in object names. (*)

            None of the above.

7.         In a physical data model, an attribute becomes a _____________.   Mark for Review

(1) Points

            Constraint

            Table

            Foreign Key

            Column (*)

8.         To resolve a many to many relationship in a physical model you create a(n) ___________________?            Mark for Review

(1) Points

            Unique key constraints

            Intersection entity

            Intersection table (*)

            Two tables with Foreign key constraints between them

9.         When an Arc is transformed to the physical model every relationship in the Arc becomes a mandatory Foreign Key. True or False?    Mark for Review

(1) Points

            True

            False (*)

10.       The Oracle Database can implement a many to many relationship. You simply create two foreign keys between the two tables. True or False?           Mark for Review

(1) Points

            True

            False (*)

11.       A barrred Relationship will result in a Foreign Key column that also is part of:        Mark for Review

(1) Points

            The Primary Key (*)

            The Column Name

            The Check Constraint

            The Table Name

12.       Column integrity refers to       Mark for Review

(1) Points

            Columns always containing positive numbers

            Columns always containing values consistent with the defined data format (*)

            Columns always containing text data less than 255 characters

            Columns always having values

13. The explanation below is an example of which constraint type?

A column must contain only values consistent with the defined data format of the column            Mark for Review

(1) Points

            Column integrity (*)

            User-defined integrity

            Referential integrity

            Entity integrity

14.       Identify all of the incorrect statements that complete this sentence: A primary key is...(Choose three)            Mark for Review

(1) Points

                                    (Choose all correct answers)  

            Only one column that must be null. (*)

            A single column that uniquely identifies each column in a table. (*)

            One or more columns in a table that uniquely identifies each row in that table.

            A set of columns in one table that uniquely identifies each row in another table. (*)

15.       Identify all of the correct statements that complete this sentence: A primary key is: (Choose Three)            Mark for Review

(1) Points

                                    (Choose all correct answers)  

            Only one column that cannot be null

            A set of columns and keys in a single table that uniquely identifies each row in a single table (*)

            A single column that uniquely identifies each row in a table (*)

            A set of columns that uniquely identifies each row in a table (*)

1.         The explanation below is an example of which constraint type?

A column must contain only values consistent with the defined data format of the column            Mark for Review

(1) Points

            User-defined integrity

            Column integrity (*)

            Referential integrity

            Entity integrity

2.         Identify all of the correct statements that complete this sentence: A primary key is: (Choose Three)            Mark for Review

(1) Points

                                    (Choose all correct answers)  

            A set of columns and keys in a single table that uniquely identifies each row in a single table (*)

            Only one column that cannot be null

            A single column that uniquely identifies each row in a table (*)

            A set of columns that uniquely identifies each row in a table (*)

3.         Identify all of the incorrect statements that complete this sentence: A primary key is...(Choose three)            Mark for Review

(1) Points

                                    (Choose all correct answers)  

            A single column that uniquely identifies each column in a table. (*)

            One or more columns in a table that uniquely identifies each row in that table.

            Only one column that must be null. (*)

            A set of columns in one table that uniquely identifies each row in another table. (*)

4. Foreign keys cannot be null when  Mark for Review

(1) Points

            It refers to another table

            It is part of a primary key (*)

            It contains three or more columns

            It refers to the same table

5.         When mapping supertypes, relationships at the supertype level transform as usual. Relationships at subtype level are implemented as foreign keys, but the foreign key columns all become mandatory. True or False?  Mark for Review

(1) Points

            True

            False (*)

6.         When mapping supertypes, relationships at the supertype level transform as usual. Relationships at the subtype level are implemented as foreign keys, but the foreign key columns all become optional. True or False?            Mark for Review

(1) Points

            True (*)

            False

7.         The "Arc Implementation" is a synonym for what type of implementation? Mark for Review

(1) Points

            Supertype and Subtype Implementation (*)

            Cascade Implementation

            Supertype Implementation

            Subtype Implementation

8.         The Physical model is created by transforming which of the following models?      Mark for Review

(1) Points

            Constraint

            Table

            Physical

            Conceptual (*)

9.         Why would this table name NOT work in an Oracle database? this_year_end+next_year   Mark for Review

(1) Points

            Table names must begin with an alphabetic character.

            It is too long.

            The Plus sign + is not allowed in object names. (*)

            None of the above.

10.       In an Oracle database, why would 1_TABLE not work as a table name?     Mark for Review

(1) Points

            There is no problem here. You can create a table called 1_TABLE.

            The database does not understand all capital letters.

            TABLE is a reserved word.

            Object names must not start with a number. They must begin with a letter. (*)

11.       Attributes become columns in a database table. True or False?         Mark for Review

(1) Points

            True (*)

            False

12.       Relationships on an ERD can only be transformed into UIDs in the physical model? True or False?            Mark for Review

(1) Points

            True

            False (*)

13.       An Arc is transformed to the physical model by adding a foeign Key for every relationship in the Arc. True or False?  Mark for Review

(1) Points

            True (*)

            False

14.       One-to-One relationships are transformed into Check Constraints in the tables created at either end of that relationship. True or False?          Mark for Review

(1) Points

            True

            False (*)

15.       One-to-One relationships are transformed into Foreign Keys in the tables created at either end of that relationship. True or False?     Mark for Review

(1) Points

            True

            False (*)

1.         When mapping supertypes, relationships at the supertype level transform as usual. Relationships at subtype level are implemented as foreign keys, but the foreign key columns all become mandatory. True or False?  Mark for Review

(1) Points

            True

            False (*)

2.         Which of the following is a valid reason for considering a Subtype Implementation?          Mark for Review

(1) Points

            The common access paths for the supertypes are different.

            Business functionality, business rules, access paths, and frequency of access are all very different between the subtypes. (*)

            Most of the relationships are at the supertype level.

            The resulting table will reside in a single database and be used by just ONE user.

3.         The "Arc Implementation" is a synonym for what type of implementation? Mark for Review

(1) Points

            Supertype and Subtype Implementation (*)

            Supertype Implementation

            Cascade Implementation

            Subtype Implementation

4.         In a physical data model, an attribute becomes a _____________.   Mark for Review

(1) Points

            Constraint

            Column (*)

            Table

            Foreign Key

                                                           

5.The conceptual model is transformed into a physical model. The physical implementation will be a relational database. True or False?          Mark for Review

(1) Points

            True (*)

            False

6.         In an Oracle database, why would the following table name not be allowed 'EMPLOYEE JOBS'?            Mark for Review

(1) Points

            The database does not understand all capital letters

            JOBS is a reserved word

            You cannot have spaces between words in a table name (*)

            EMPLOYEE is a reserved word

7. In an Oracle database, why would 1_TABLE not work as a table name? Mark for Review

(1) Points

            There is no problem here. You can create a table called 1_TABLE.

            Object names must not start with a number. They must begin with a letter. (*)

            The database does not understand all capital letters.

            TABLE is a reserved word.

8.         When an Arc is transformed to the physical model every relationship in the Arc becomes a mandatory Foreign Key. True or False?    Mark for Review

(1) Points

            True

            False (*)

9.         One-to-Many Optional to Mandatory becomes a _______________ on the Master table.   Mark for Review

(1) Points

            Optional Foreign Key (*)

            Unique Key

            Primary Key

            Mandatory Foreign Key

10.       An Arc is transformed to the physical model by adding a foeign Key for every relationship in the Arc. True or False?  Mark for Review

(1) Points

            True (*)

            False

11.       A barrred Relationship will result in a Foreign Key column that also is part of:        Mark for Review

(1) Points

            The Check Constraint

            The Column Name

            The Table Name

            The Primary Key (*)

12.       Foreign keys must be null. True or False?       Mark for Review

(1) Points

            True

            False (*)

13.       The explanation below is an example of which constraint type?

A primary key must be unique, and no part of the primary key can be null.  Mark for Review

(1) Points

            Column integrity

            User-defined integrity

            Referential integrity

            Entity integrity (*)

14.       Identify all of the incorrect statements that complete this sentence: A primary key is...(Choose three)            Mark for Review

(1) Points

                                    (Choose all correct answers)  

            A set of columns in one table that uniquely identifies each row in another table. (*)

            One or more columns in a table that uniquely identifies each row in that table.

            Only one column that must be null. (*)

            A single column that uniquely identifies each column in a table. (*)

15.       A foreign key always refers to a primary key in the same table. True or False?         Mark for Review

(1) Points

            True

            False (*)

1.         The conceptual model is transformed into a physical model. The physical implementation will be a relational database. True or False?      Mark for Review

(1) Points

            True (*)

            False

2. In an Oracle database, why would the following table name not be allowed 'EMPLOYEE JOBS'?       Mark for Review

(1) Points

            You cannot have spaces between words in a table name (*)

            The database does not understand all capital letters

            EMPLOYEE is a reserved word

            JOBS is a reserved word

3.         Attributes become columns in a database table. True or False?         Mark for Review

(1) Points

            True (*)

            False

4. The transformation from an ER diagram to a physical design involves changing terminology. Entities in the ER diagram become __________ :     Mark for Review

(1) Points

            Unique Keys

            Tables (*)

            Columns

            Foreign Keys

5.         Foreign keys must be null. True or False?       Mark for Review

(1) Points

            True

            False (*)

6.         A table does not have to have a primary key. True or False? Mark for Review

(1) Points

            True (*)

            False

7.         The explanation below is an example of which constraint type?

If the value in the balance column of the ACCOUNTS table is below 100, we must send a letter to the account owner which will require extra programming to enforce.     Mark for Review

(1) Points

            Column integrity

            Referential integrity

            Entity integrity

            User-defined integrity (*)

8.         Column integrity refers to       Mark for Review

(1) Points

            Columns always containing text data less than 255 characters

            Columns always containing positive numbers

            Columns always containing values consistent with the defined data format (*)

            Columns always having values

9.         Which of the following is a valid reason for considering a Subtype Implementation?          Mark for Review

(1) Points

            The resulting table will reside in a single database and be used by just ONE user.

            The common access paths for the supertypes are different.

            Most of the relationships are at the supertype level.

            Business functionality, business rules, access paths, and frequency of access are all very different between the subtypes. (*)

10.       An "Arc Implementation" can be done just like any other Relationship - you simply add the required Foreign Keys. True or False?  Mark for Review

(1) Points

            True

            False (*)

11.       When mapping supertypes, relationships at the supertype level transform as usual. Relationships at the subtype level are implemented as foreign keys, but the foreign key columns all become optional. True or False?            Mark for Review

(1) Points

            True (*)

            False

12.       To resolve a many to many relationship in a physical model you create a(n) ___________________?            Mark for Review

(1) Points

            Two tables with Foreign key constraints between them

            Intersection table (*)

            Unique key constraints

            Intersection entity

13.       Relationships on an ERD can only be transformed into UIDs in the physical model? True or False?            Mark for Review

(1) Points

            True

            False (*)

14.       The Oracle Database can implement a many to many relationship. You simply create two foreign keys between the two tables. True or False?           Mark for Review

(1) Points

            True

            False (*)

15.       One-to-One relationships are transformed into Check Constraints in the tables created at either end of that relationship. True or False?          Mark for Review

(1) Points

            True

            False (*)

1.         When mapping supertypes, relationships at the supertype level transform as usual. Relationships at the subtype level are implemented as foreign keys, but the foreign key columns all become optional. True or False?            Mark for Review

(1) Points

            True (*)

            False

2.         When mapping supertypes, relationships at the supertype level transform as usual. Relationships at subtype level are implemented as foreign keys, but the foreign key columns all become mandatory. True or False?  Mark for Review

(1) Points

            True

            False (*)

3.         Which of the following is a valid reason for considering a Subtype Implementation?          Mark for Review

(1) Points

            Business functionality, business rules, access paths, and frequency of access are all very different between the subtypes. (*)

            Most of the relationships are at the supertype level.

            The common access paths for the supertypes are different.

            The resulting table will reside in a single database and be used by just ONE user.

4.         The explanation below is an example of which constraint type?

A column must contain only values consistent with the defined data format of the column            Mark for Review

(1) Points

            Column integrity (*)

            User-defined integrity

            Entity integrity

            Referential integrity

5.         A table must have a primary key. True or False?        Mark for Review

(1) Points

            True

            False (*)

6.         Identify all of the incorrect statements that complete this sentence: A primary key is...(Choose three)            Mark for Review

(1) Points

                                    (Choose all correct answers)  

            A single column that uniquely identifies each column in a table. (*)

            A set of columns in one table that uniquely identifies each row in another table. (*)

            Only one column that must be null. (*)

            One or more columns in a table that uniquely identifies each row in that table.

7.         The explanation below is an example of which constraint type?

The value in the dept_no column of the EMPLOYEES table must match a value in the dept_no column in the DEPARTMENTS table.         Mark for Review

(1) Points

            Referential integrity (*)

            Column integrity

            User-defined integrity

            Entity integrity

8.         In a physical model, many to many relationships are resolved via a structure called a(n): ________________    Mark for Review

(1) Points

            Intersection Entity

            Intersection Table (*)

            Subtype

            Supertype

9.         To resolve a many to many relationship in a physical model you create a(n) ___________________?            Mark for Review

(1) Points

            Two tables with Foreign key constraints between them

            Intersection entity

            Intersection table (*)

            Unique key constraints

10.       A barrred Relationship will result in a Foreign Key column that also is part of:        Mark for Review

(1) Points

            The Check Constraint

            The Column Name

            The Primary Key (*)

            The Table Name

11.       Relationships on an ERD can only be transformed into UIDs in the physical model? True or False?            Mark for Review

(1) Points

            True

            False (*)

12.       Attributes become columns in a database table. True or False?         Mark for Review

(1) Points

            True (*)

            False

13.       Why would this table name NOT work in an Oracle database? this_year_end+next_year   Mark for Review

(1) Points

            Table names must begin with an alphabetic character.

            It is too long.

            The Plus sign + is not allowed in object names. (*)

            None of the above.

14.       In an Oracle database, why would 1_TABLE not work as a table name?     Mark for Review

(1) Points

            TABLE is a reserved word.

            There is no problem here. You can create a table called 1_TABLE.

            The database does not understand all capital letters.

            Object names must not start with a number. They must begin with a letter. (*)

15.       In a physical data model, an attribute becomes a _____________.   Mark for Review

(1) Points

            Constraint

            Table

            Foreign Key

            Column (*)