Centrally coordinated information for a related group of files A relegated group of records A related group of fields A specific attribute of interest for the entity organizational-wide of the data individual user's view of the data describes how data are stored and accessed Anything about which in the organization wants to collect and store information A characteristic of an entity Contains data about one instance of an entity contains data about one instance of an entity contains data about one attribute that can be used to uniquely a specific how (record) in a table an attribute or combined of attributed in one table that is a primary key in another table used to like two tables together Not a primary key or a foreign key A primary is not null (empty) and must be unique If a foreign key is null, if must watch the value of a primary key in another table the inter face between software and applications and data tables person responsible for maintaining the database Non-key attribution Field database manager system Record Entity Conceptual level schema database administer internal level schema Entity integrity rule Referential integrity Database Primary Key File Field/column Foreign Key External level schema Row/record attribute