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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).
In systems analysis, a one-to-many relationship is a type of cardinality that refers to the relationship between two entities (see also entity–relationship model). For example, take a car and an owner of the car. The car can only be owned by one owner at a time or not owned at all, and an owner could own zero, one, or multiple cars.
The ER – International Conference on Conceptual Modeling is an annual research conference computer science dedicated to information and conceptual modeling.Since the first event in 1979 in Los Angeles, California, USA, the conference has evolved into one of the major forums for research on conceptual modeling and information retrieval.
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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 .
For instance, Chen (2015) provides examples using randomized experiments, quasi-experimental designs, process and outcome monitoring, and qualitative methods. [26] Although proponents of theory-driven evaluation are critical of "black box" experiments, Chen and Rossi (1983, p. 292) [ 27 ] argue that theory-driven experiments are possible and ...
There are several things you can do at home to help an older dog with arthritis, including changing her diet. Photo by manfredxy, Canva
Peter Pin-Shan Chen (Chinese: 陳品山; born 3 January 1947) is a Taiwanese-American computer scientist and applied mathematician.He is a retired distinguished career scientist and faculty member at Carnegie Mellon University and Distinguished Chair Professor Emeritus at Louisiana State University.