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An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).
An associative entity is a term used in relational and entity–relationship theory. A relational database requires the implementation of a base relation (or base table) to resolve many-to-many relationships. A base relation representing this kind of entity is called, informally, an associative table. An associative entity (using Chen notation)
A sample ER diagram. Database requirements for a CD collection in EXPRESS-G notation.. In 1976, an entity-relationship (ER) graphic notation was introduced by Peter Chen.He stressed that it was a "semantic" modelling technique and independent of any database modelling techniques such as Hierarchical, CODASYL, Relational etc. [2] Since then, languages for information models have continued to ...
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Jing-Mei Chen, M.D. is a fictional character from the medical drama series ER, portrayed by Ming-Na Wen. [1] The character first appears in the first season as a recurring guest character, going by the name Debra "Deb" Chen .
You know, if you look at the state of Florida on a map in just the right way — like, upside down — it looks like a giant “L.” And right now, that’s appropriate, because this weekend ...
“For example, after a recall, you could offer a treat from your hand, toss one for a fun chase, then scatter a few on the ground for a sniffy reward” she suggests. “This variety keeps ...