Podcast
Questions and Answers
What are the three types of data models and how do they differ from each other?
What are the three types of data models and how do they differ from each other?
The three types of data models are physical, logical, and semantic models. Physical models specify how data are physically stored, logical models describe all data on a logical level regardless of how it is stored, and semantic models depict the data on a technology-neutral level.
What is the purpose of the entity relationship model (ERM) and when is it used?
What is the purpose of the entity relationship model (ERM) and when is it used?
The entity relationship model (ERM) is used in the conceptual phase of application development to structure the communication between users and developers, as well as in the implementation phase as a basis for database design. Its purpose is to model operational data structures.
What is the significance of star and snowflake schemas in data modeling?
What is the significance of star and snowflake schemas in data modeling?
Star and snowflake schemas allow performance-oriented modeling of multidimensional data spaces in business intelligence.
