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Podcast
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Questions and Answers
Questions and Answers
What is the primary focus of First Normal Form (1NF)?
What is the primary focus of First Normal Form (1NF)?
- Splitting data into atomic values
- Avoiding partial dependency
- Ensuring all rows are unique and each cell contains a single value (correct)
- Ensuring all non-prime attributes are fully functionally dependent on the candidate key
Which problem does the solution 'add an order ID as a primary key' address?
Which problem does the solution 'add an order ID as a primary key' address?
- Non-divisible Values
- Identical Rows (correct)
- Partial Dependency
- Atomicity of Data
What is the primary concern of Second Normal Form (2NF)?
What is the primary concern of Second Normal Form (2NF)?
- Ensuring all rows are unique and each cell contains a single value
- Avoiding partial dependency
- Ensuring all non-prime attributes are fully functionally dependent on the candidate key (correct)
- Splitting data into atomic values
In the context of database normalization, what does partial dependency refer to?
In the context of database normalization, what does partial dependency refer to?
Which best describes a candidate key in a database table?
Which best describes a candidate key in a database table?
How does the solution 'Create a separate table with order items' relate to First Normal Form (1NF)?
How does the solution 'Create a separate table with order items' relate to First Normal Form (1NF)?
What is the primary function of a super key in a relational database?
What is the primary function of a super key in a relational database?
Which type of key can be considered as strong as the primary key in a relational database?
Which type of key can be considered as strong as the primary key in a relational database?
In the context of relational databases, what does transitive dependency refer to?
In the context of relational databases, what does transitive dependency refer to?
Which type of key is used to point to the primary key of another table in a relational database?
Which type of key is used to point to the primary key of another table in a relational database?
What is the main reason for a table not being in 2NF (Second Normal Form) in a relational database?
What is the main reason for a table not being in 2NF (Second Normal Form) in a relational database?
Which attribute or set of attributes can uniquely identify a tuple in a relational database, except for the primary key?
Which attribute or set of attributes can uniquely identify a tuple in a relational database, except for the primary key?
What is the main purpose of a foreign key in a relational database?
What is the main purpose of a foreign key in a relational database?
In the context of relational databases, what is the role of a candidate key?
In the context of relational databases, what is the role of a candidate key?
In a relational database, what condition must be met for a table to be in First & Second Normal Form?
In a relational database, what condition must be met for a table to be in First & Second Normal Form?
What should be the main consideration for selecting the primary key in an entity?
What should be the main consideration for selecting the primary key in an entity?
Questions and Answers
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Flashcards
Flashcards
First Normal Form (1NF)
First Normal Form (1NF)
A database design principle ensuring all rows are unique and each cell contains a single value.
Identical Rows Issue
Identical Rows Issue
Occurs when multiple rows in a database table have the same data, leading to ambiguity.
Second Normal Form (2NF)
Second Normal Form (2NF)
A normalization rule ensuring all non-prime attributes depend fully on the candidate key.
Partial Dependency
Partial Dependency
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Candidate Key
Candidate Key
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Order Items Table Solution
Order Items Table Solution
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Super Key
Super Key
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Strong Key
Strong Key
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Transitive Dependency
Transitive Dependency
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Foreign Key
Foreign Key
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Not in 2NF
Not in 2NF
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Candidate Key Role
Candidate Key Role
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First & Second Normal Form Condition
First & Second Normal Form Condition
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Primary Key Selection
Primary Key Selection
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Non-Prime Attribute
Non-Prime Attribute
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Database Normalization Purpose
Database Normalization Purpose
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Study Notes
Study Notes
Database Normalization
- First Normal Form (1NF) focuses on eliminating repeating groups in tables.
Primary Key and Candidate Key
- Adding an order ID as a primary key solves the problem of identifying unique orders.
- A candidate key is a minimal set of attributes that can uniquely identify a tuple in a relational database.
- A super key is a set of attributes that can uniquely identify a tuple in a relational database.
Second Normal Form (2NF)
- 2NF's primary concern is to eliminate partial dependencies, which occur when a non-prime attribute depends on only one part of the primary key.
- A table not in 2NF means that a non-prime attribute depends on only one part of the primary key.
Foreign Key and Relationships
- A foreign key is used to point to the primary key of another table in a relational database.
- The main purpose of a foreign key is to establish relationships between tables.
Key Selection and Normalization
- A key can be considered as strong as the primary key if it can uniquely identify a tuple.
- For a table to be in 1NF and 2NF, it must have a primary key, and all non-prime attributes must depend on the entire primary key.
- When selecting a primary key, the main consideration should be that it can uniquely identify a tuple.
Dependency and Relations
- Partial dependency refers to a situation where a non-prime attribute depends on only one part of the primary key.
- Transitive dependency occurs when a non-prime attribute depends on another non-prime attribute.
- A candidate key can be used to establish relationships between tables.
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