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Questions and Answers
What is the primary focus of First Normal Form (1NF)?
Which problem does the solution 'add an order ID as a primary key' address?
What is the primary concern of Second Normal Form (2NF)?
In the context of database normalization, what does partial dependency refer to?
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Which best describes a candidate key in a database table?
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How does the solution 'Create a separate table with order items' relate to First Normal Form (1NF)?
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What is the primary function of a super key in a relational database?
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Which type of key can be considered as strong as the primary key in a relational database?
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In the context of relational databases, what does transitive dependency refer to?
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Which type of key is used to point to the primary key of another table in a relational database?
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What is the main reason for a table not being in 2NF (Second Normal Form) in a relational database?
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Which attribute or set of attributes can uniquely identify a tuple in a relational database, except for the primary key?
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What is the main purpose of a foreign key in a relational database?
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In the context of relational databases, what is the role of a candidate key?
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In a relational database, what condition must be met for a table to be in First & Second Normal Form?
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What should be the main consideration for selecting the primary key in an entity?
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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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Description
Test your knowledge of database normalization by taking this quiz focusing on 1NF, 2NF, and 3NF. Learn about ensuring unique rows, single values in cells, and the process of normalizing data.
