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Questions and Answers
What do integer data types represent in relational databases?
What do integer data types represent in relational databases?
What is the main difference between CHAR and VARCHAR character data types?
What is the main difference between CHAR and VARCHAR character data types?
What do decimal data types represent in relational databases?
What do decimal data types represent in relational databases?
What is the purpose of binary data types in relational databases?
What is the purpose of binary data types in relational databases?
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What type of data does the DATE data type represent in relational databases?
What type of data does the DATE data type represent in relational databases?
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What is the main characteristic of VARCHAR character data types?
What is the main characteristic of VARCHAR character data types?
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What type of data does the BLOB data type represent in relational databases?
What type of data does the BLOB data type represent in relational databases?
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What is the main difference between INT and SMALLINT integer data types?
What is the main difference between INT and SMALLINT integer data types?
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What do spatial data types represent in relational databases?
What do spatial data types represent in relational databases?
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What type of data does the TIMESTAMP data type represent in relational databases?
What type of data does the TIMESTAMP data type represent in relational databases?
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Study Notes
Big Data and Database Models
- The rise of the internet in the 1990s generated big data, characterized by unprecedented data volumes and rapidly changing data structures.
- Alternative database models and systems optimized for big data have appeared since 2000.
- Relational databases have gradually improved support for big data and continue to dominate the commercial database market.
Database Models
- Hierarchical database model: uses a tree-like structure to organize data.
- Network database model: uses a graph structure to organize data.
- Linked list database model: uses a series of linked records to organize data.
- Relational database model: uses tables with rows and columns to organize data.
- Object-oriented database model: uses objects and classes to organize data.
- Graph database model: uses vertices and edges to organize data.
- Document-oriented database model: uses self-describing data structures such as XML and JSON.
Relational Database Rules
- Relational rules govern tables, including:
- Exactly one value per cell.
- Unknown data is represented with a special NULL value.
- No duplicate column names.
- No duplicate rows.
- No row order.
Data Types
- INT or INTEGER: represents integer values.
- VARCHAR(N): represents values with 0 to N characters.
- DATE: represents date values.
- DECIMAL(M, D): represents numeric values with M digits, of which D digits follow the decimal point.
- Other data types include:
- Spatial data types: store geometric information, such as lines, polygons, and map coordinates.
- Binary data types: store data exactly as it appears in memory or computer files, bit for bit.
SQL Statements
- CREATE TABLE statement: creates a new table with specified columns and data types.
- DROP TABLE statement: deletes a table, along with all its rows, from a database.
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Description
Explore the evolution of database management systems, from relational databases to alternative models optimized for big data. This quiz covers database structures, primary data structures, and product releases.
