Database System Concepts and Architecture 2.1 Define the following terms: data model, database schema, database state, internal schema, conceptual schema, external schema, data independence, DDL, DML, SDL, VDL, query language, host language, data sub language, database utility, catalog, client/server architecture, three-tier architecture, and n-tier architecture. 2.2. Discuss the main categories of data models. What are […]