Learn what an entity-relationship (ER) diagram is, why it is useful for data modeling, how to create it, and what types of ER diagrams exist. Sign in to view more content ...

An ER diagram is a graphical representation of the entities, attributes, and relationships in a database. It helps you design, document, and communicate your database structure and requirements.

Three-dimensional diagrams composed of jigsaw-puzzle-like glyphs are proposed for representing syntactical constraints. The 3D glyphs have convex and concave shapes that give visual representation to ...