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Peter Chen
See his article :
The Entity-Relationship Model-Toward a Unified View of Data
by PETER PIN-SHAN CHEN
Wiki User
∙ 11y ago
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What ye er was lemonade invented?
By the year 1299,the Mongolians had invented lemonade.
Differentiate between the E-R model and Relational model?
er model is a collection of attributes
What is ER models?
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.
Why was the iPhone 5 invented?
itt was invented to update and upgrade to a newwer and bette er iPjone
What were LEGO's originally invented for?
Legos were originally invented for model cars and model planes, and even model tractors.
When was the model T and model A ford invented?
The Model T was invented in 1908 and went out of production on may 26 1927. The model A went on.
What is the wattage on a Goldstar microwave model ER-711M?
600W
Was the model T invented in 1920?
No, it was invented in 1909.
Who invented sup er computer?
cavemen have been living to the dawn of time
In model ER why you need DBMS system?
Because it is very useful in mapping the meanings and interactions of real-world enterprises onto a conceptual schema. Because of this usefulness, many database-design tools draw on concepts from the ER-model. The ER data model employs three basic notation:a.) Entity setsb.) Relationship setsc.) Attributes.
When was the Model T invented?
It was invented in 1908 by Henry Ford
Who invented the model rocket?
He invented the rocket in 1926
