integrated collection of concepts for describing data, relationships between data, and constraints on the data in an organization. purpose: to represent data in an understandable way.
integrated collection of concepts for describing data, relationships between data, and constraints on the data in an organization. purpose: to represent data in an understandable way.
a higher level description of the schema; an integrated collection of concepts for describing and manipulating data, relationships between data, and constraints on the data in an organization