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 sublanguage, database utility, catalog, client/server architecture, three-tier architecture, and n-tier architecture.
Data Model:
Database Schema:
Database State:
Internal Schema:
Conceptual Schema:
External Schema:
Data Independence:
DDL (Data Definition Language):
DML (Data Manipulation Language):
SDL (Storage Definition Language):
VDL (View Definition Language):
Query Language:
Host Language:
Data Sublanguage:
Database Utility:
Catalog:
Client/Server Architecture:
Three-Tier Architecture:
N-Tier Architecture: