Peter Chen
See his article :
The Entity-Relationship Model-Toward a Unified View of Data
by PETER PIN-SHAN CHEN
By the year 1299,the Mongolians had invented lemonade.
The Entity-Relationship Model is often referred to as a semantic data model, because it more closely resembles real world scenarios than, e.g., the relational model. . In the ER model, we model the concept of "Instructors." In the relational model we deal with names and phone numbers. . In the ER model, there is a distinction between entities (objects) and relationships between such entities. In the relational model, both concepts are represented by relations.
The two types of ER (Entity-Relationship) models commonly used in database design are the conceptual ER model, which describes the high-level concepts and relationships in a system, and the logical ER model, which defines the structure and constraints of the database in more detail.
itt was invented to update and upgrade to a newwer and bette er iPjone
Legos were originally invented for model cars and model planes, and even model tractors.
The Model T was invented in 1908 and went out of production on may 26 1927. The model A went on.
The Model T was invented in 1908 by Henry Ford.
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No, it was invented in 1909.
cavemen have been living to the dawn of time
He invented the rocket in 1926
It was invented in 1908 by Henry Ford