Podcast
Questions and Answers
What is the primary function of a database management system (DBMS)?
What is the primary function of a database management system (DBMS)?
To define, create, maintain, and manipulate databases.
What is the key characteristic of a relational database?
What is the key characteristic of a relational database?
Organizing data into tables with rows and columns.
What is the purpose of the Third Normal Form (3NF) in database normalization?
What is the purpose of the Third Normal Form (3NF) in database normalization?
To move non-key attributes that depend on other non-key attributes to a separate table.
What is the main concept behind Entity-Relationship (ER) modeling in database design?
What is the main concept behind Entity-Relationship (ER) modeling in database design?
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What is the primary difference between relational and NoSQL databases?
What is the primary difference between relational and NoSQL databases?
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What is the overall structure of a database, including relationships between tables, referred to as?
What is the overall structure of a database, including relationships between tables, referred to as?
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Study Notes
Database Fundamentals
- A database is a collection of organized data that is stored in a way that allows for efficient retrieval and manipulation.
- A database management system (DBMS) is a software system that allows you to define, create, maintain, and manipulate databases.
Database Types
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Relational databases:
- Organize data into one or more tables with rows and columns.
- Each row represents a single record, and each column represents a field or attribute.
- Examples: MySQL, PostgreSQL, Microsoft SQL Server.
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NoSQL databases:
- Designed to handle large amounts of unstructured or semi-structured data.
- Examples: MongoDB, Cassandra, Redis.
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Object-oriented databases:
- Store data in the form of objects, similar to object-oriented programming.
- Examples: Gemstone, Matisse.
Database Normalization
- First Normal Form (1NF): Each table cell must contain a single value.
- Second Normal Form (2NF): Each non-key attribute in a table must depend on the entire primary key.
- Third Normal Form (3NF): If a table is in 2NF, and a non-key attribute depends on another non-key attribute, then it should be moved to a separate table.
Database Design
- Entity-Relationship (ER) modeling: A methodology for designing databases that uses entities, attributes, and relationships to represent data.
- Schema: The overall structure of a database, including the relationships between tables.
Database Operations
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CRUD:
- Create: Insert new data into the database.
- Read: Retrieve data from the database.
- Update: Modify existing data in the database.
- Delete: Remove data from the database.
- Querying: Retrieving specific data from a database using a query language, such as SQL.
Database Security
- Authentication: Verifying the identity of a user or system.
- Authorization: Controlling access to database resources based on user identity and permissions.
- Encryption: Protecting data in transit or at rest using encryption algorithms.
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Description
Test your knowledge of database concepts, including database types, normalization, design, operations, and security. Covers relational and NoSQL databases, CRUD operations, and database modeling.
