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
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
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.