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# SQL
# SQL Database
- Database is a collection of related data.
- Data is: known facts that can be recorded and have implicit meaning.
- Database is a collection of values in digital form, organized in a efficient way
## Data modeling
Data model is a collection of concepts to describe the structure of a database.
Structure of a database includes data types, relationships and constraints that apply to the data.
- High Level: Conceptual data models
- Low Level: Physical data models
- Representational: implementational data models