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COP 4710 Final Exam Question and answers correctly solved 2024

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COP 4710 Final Exam Question and answers correctly solved 2024 COP 4710 Final Exam A table is in Second Normal Form if it - correct answer no partial key dependencies. Second and Third Normal Forms are both concerned with an attribute that is - correct answer a non-key determinant. In 2N...

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  • September 7, 2024
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COP 4710 Final Exam
A table is in Second Normal Form if it - correct answer ✔no partial key
dependencies.


Second and Third Normal Forms are both concerned with an attribute that is -
correct answer ✔a non-key determinant. In 2NF, the non-key determinant is
a component of the table's composite key, and in 3NF the non-key
determinant is outside of the table's key.


When we achieve this normal form, there are no non-key functional
dependencies in a table. That means that all attributes in the table describe
the key, and don't belong to some other object. - correct answer ✔1NF
eliminates non-atomic and repeating attributes in a table. 2NF and 3NF
describe a determinant that doesn't belong to the key.


If employeeID is the key of a table, then it's a - correct answer ✔determinant.


The only functional dependencies in a table should - correct answer ✔be key
dependencies.


A deletion anomaly is - correct answer ✔is the side effect of placing data
about more than one object in the same table. When a row is deleted, data
about both objects is eliminated.


Generally, unnormalized tables are normalized by - correct answer
✔Dividing the table into two, one for each object ("decomposition"), eliminates
redundancy, solves modification anomalies, and brings the table to a higher
normal form.

, What is "Data Redundancy" in a table? - correct answer ✔Redundancy is the
repetition of the same fact more than once in a table. Multiple rows repeat the
same fact over and over.


Unnormalized tables are undesirable because they - correct answer ✔t. An
unnormalized table is undesirable because it has these negative
characteristics:


Unnormalized tables have data redundancies.
Data redundancies cause modification anomalies.
Modification anomalies make the data unreliable and hard to maintain.
the other answers (more tables, more joins, and slower performance) are
drawbacks of normalized tables. The benefits of normalization usually
outweigh the drawbacks.


First Normal Form means - correct answer ✔First Normal Form means that
attributes in a table must be:


Atomic, meaning that a single attribute cannot contain a list, array, or other
structure that must be searched or processed to determine its contents.
Non-repeating, meaning that an attribute cannot be duplicated multiple times
in a row to produce a list within a single row.


The method for normalizing a table is: - correct answer ✔involves
decomposing a table into two new tables.


If a table has a pair of columns that provide the same information but uses
different terms (such as "date-of-birth" and "age"), then the columns risk
getting out of agreement with each other.

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