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Questions and Answers
What is a database?
What is a database?
An organized collection of data, generally stored and accessed electronically from a computer system.
Which of the following are examples of database systems?
Which of the following are examples of database systems?
Access is a multi-user database.
Access is a multi-user database.
False
The _____ schema database uses facts and dimensions.
The _____ schema database uses facts and dimensions.
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Match the following database types with their characteristics:
Match the following database types with their characteristics:
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What are some tools for data analytics and visualization?
What are some tools for data analytics and visualization?
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Study Notes
Databases
- An organized collection of data that's stored and accessed electronically.
- More complex databases are developed using formal design and modeling techniques.
- Uses Entity-Relationship Diagram (ERD) and SQL.
- Multi-user, secure, performant, accessible, and with supporting infrastructure.
Database Systems
- Support business, enterprises, and web-enabled applications.
- Examples include Oracle, Apex.
- Use SQL for data manipulation.
- Include fundamentals of databases and database systems.
Online Transaction Processing (OLTP) Systems
- Use databases for real-time transaction processing like online ordering or bank transactions.
NoSQL Databases
- Support large data volumes.
- Different modeling approaches include document, key-value pairs, and wide columns.
- Examples include MongoDB, Cassandra, and Hadoop.
- Focuses on scalability and flexibility over structured data.
Entity Relationship Diagram (ERD)
- A graphical representation of entities and their relationships in a database.
- Entities are objects or concepts (e.g., customers, products).
- Relationships describe how entities interact (e.g., one-to-many, many-to-many).
- Uses primary keys (PK) and foreign keys (FK) to establish relationships.
Oracle – An Entity-Relationship Diagram (ERD)
- An example of a database management system used in business, enterprises, and web-enabled applications.
- Demonstrates the use of ERDs for database design.
Star Schema Database
- Used for data warehousing and decision support systems (DSS).
- Focuses on storing data for analysis and reporting.
- Uses facts (measures) and dimensions.
- Similar to OLAP in pivot tables.
Excel
- Uses spreadsheets with worksheets linked by PK/FK.
Access
- A relational database management system.
- Offers limited security and multi-user capabilities.
Tools for Data Analytics and Visualization
- Tableau, R, Matlab, KNIME and RapidMiner are examples of software used for data analysis and visualization.
- Used in different modules and for data analysis tasks.
SQL – The Universal Language
- Used to access and manipulate data in databases.
- A powerful language for querying, inserting, updating, and deleting data.
- Essential for data management and analysis.
Importance of Database Systems
- Database systems are central to many businesses and organizations.
- The choice of database system depends on the specific business needs and characteristics.
- Databases are often recognized by their brand names (e.g., Oracle, MySQL, SQL Server, DB2).
- The role and support provided by each database system determines its suitability for different applications.
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Description
Explore the fundamentals of database systems in this quiz, including various types such as OLTP and NoSQL databases. Understand key concepts like Entity-Relationship Diagrams (ERD) and the role of SQL in data manipulation. Test your knowledge on how databases support business and web applications.
