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Questions and Answers
Normalization is the process of evaluating and correcting table structures to minimize data ______.
Normalization is the process of evaluating and correcting table structures to minimize data ______.
redundancies
First normal form (1NF) assigns attributes to tables based on ______.
First normal form (1NF) assigns attributes to tables based on ______.
determination
Denormalization produces a ______ normal form.
Denormalization produces a ______ normal form.
lower
Higher normal forms are ______ than lower normal forms.
Higher normal forms are ______ than lower normal forms.
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Normalization is used while designing a new ______ structure
Normalization is used while designing a new ______ structure
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Normalization improves the existing data ______ and creates an appropriate database design
Normalization improves the existing data ______ and creates an appropriate database design
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The objective of the normalization process is to ensure that each table conforms to the concept of well-formed ______
The objective of the normalization process is to ensure that each table conforms to the concept of well-formed ______
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The normalization process progressively breaks the relation up into a new set of ______
The normalization process progressively breaks the relation up into a new set of ______
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StudentAdvisor is fully functionally dependent on ______
StudentAdvisor is fully functionally dependent on ______
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A partial dependency occurs when an attribute depends on only part of the ______
A partial dependency occurs when an attribute depends on only part of the ______
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The Grade depends on both StudentID and ______
The Grade depends on both StudentID and ______
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The ProductName only depends on the ______
The ProductName only depends on the ______
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Knowing the PROJ_NUM and EMP_NUM values will let you find the job classification and its ______.
Knowing the PROJ_NUM and EMP_NUM values will let you find the job classification and its ______.
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HOURS attribute represents the number of hours an employee worked on a specific project and CHG_HOUR is the amount ______ per hour.
HOURS attribute represents the number of hours an employee worked on a specific project and CHG_HOUR is the amount ______ per hour.
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Normalization should be part of the ______ process.
Normalization should be part of the ______ process.
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Normalized tables help minimize data ______.
Normalized tables help minimize data ______.
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Entity names: Should be nouns that are familiar to ______
Entity names: Should be nouns that are familiar to ______
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Should document abbreviations, synonyms, and ______ for each entity
Should document abbreviations, synonyms, and ______ for each entity
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Should be unique ______ the model
Should be unique ______ the model
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Attribute names: Should be unique ______ the entity
Attribute names: Should be unique ______ the entity
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Should use suffixes such as _ID, _NUM, or _CODE for the ______ attribute
Should use suffixes such as _ID, _NUM, or _CODE for the ______ attribute
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Entities: Each entity should represent a single ______
Entities: Each entity should represent a single ______
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Functional dependence (generalized definition) Attribute A determines attribute B (that is, B is functionally dependent on A) if you look at all the rows in a table and see that they have the same value for attribute A, they will also have the same value for attribute ______.
Functional dependence (generalized definition) Attribute A determines attribute B (that is, B is functionally dependent on A) if you look at all the rows in a table and see that they have the same value for attribute A, they will also have the same value for attribute ______.
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Fully functional dependence (composite key) If attribute B is functionally dependent on a composite key A but not on any subset of that composite key, the attribute B is fully functionally dependent on ______.
Fully functional dependence (composite key) If attribute B is functionally dependent on a composite key A but not on any subset of that composite key, the attribute B is fully functionally dependent on ______.
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This dataset is not in 1NF because the ______ column contains multiple authors separated by commas.
This dataset is not in 1NF because the ______ column contains multiple authors separated by commas.
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Conversion to First Normal Form (1NF) (1 of 3) Repeating group: group of multiple entries of same type can exist for any single ______ attribute occurrence.
Conversion to First Normal Form (1NF) (1 of 3) Repeating group: group of multiple entries of same type can exist for any single ______ attribute occurrence.
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1NF describes tabular format in which: All key attributes are defined There are no multi-valued ______ in the table All attributes are dependent on the primary key All relational tables satisfy 1NF requirements
1NF describes tabular format in which: All key attributes are defined There are no multi-valued ______ in the table All attributes are dependent on the primary key All relational tables satisfy 1NF requirements
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Conversion to 2NF occurs only when the 1NF has a composite primary key If the 1NF has a single-attribute primary key, then the table is automatically in ______
Conversion to 2NF occurs only when the 1NF has a composite primary key If the 1NF has a single-attribute primary key, then the table is automatically in ______
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"BookID" is the primary key. However, "Author" depends on both "BookID" and "Title." To achieve 2NF, we create two tables: "Books" and ______.
"BookID" is the primary key. However, "Author" depends on both "BookID" and "Title." To achieve 2NF, we create two tables: "Books" and ______.
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The data anomalies created by the database organization shown in Figure 6.4 are easily eliminated Make new tables to eliminate ______ dependencies Reassign corresponding dependent attributes Table is in 3NF when it: Is in 2NF Contains no transitive dependencies
The data anomalies created by the database organization shown in Figure 6.4 are easily eliminated Make new tables to eliminate ______ dependencies Reassign corresponding dependent attributes Table is in 3NF when it: Is in 2NF Contains no transitive dependencies
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Study Notes
Normalization
- Normalization is the process of evaluating and correcting table structures to minimize data redundancy.
- First normal form (1NF) assigns attributes to tables based on a single value for each attribute.
- Denormalization produces a lower normal form.
Normalization Forms
- Higher normal forms are more desirable than lower normal forms.
- Second normal form (2NF) occurs when the 1NF has a composite primary key.
- A table is in 3NF when it is in 2NF and contains no transitive dependencies.
Functional Dependence
- Attribute A determines attribute B if you look at all the rows in a table and see that they have the same value for attribute A, they will also have the same value for attribute B.
- Fully functional dependence (composite key) occurs when attribute B is functionally dependent on a composite key A but not on any subset of that composite key.
Table Design
- Normalization is used while designing a new database structure.
- Normalization improves the existing data structure and creates an appropriate database design.
- The objective of the normalization process is to ensure that each table conforms to the concept of well-formed relations.
Entity and Attribute Names
- Entity names should be nouns that are familiar to the users.
- Entity names should document abbreviations, synonyms, and definitions for each entity.
- Attribute names should be unique within the entity.
- Attribute names should use suffixes such as _ID, _NUM, or _CODE for the identifier attribute.
Entities and Attributes
- Each entity should represent a single concept or object.
- Entities should have unique names within the model.
- Attributes should be dependent on the primary key.
Data Anomalies
- Data anomalies can be eliminated by making new tables to eliminate partial dependencies and reassigning corresponding dependent attributes.
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Description
This quiz tests your understanding of the dataset structure and how to find job classification and hourly charge based on project and employee numbers.
