Her father, Robert B. Maddow, is a former United States Air Force captain who resigned his commission the year before her birth and then worked as a lawyer for the East Bay Municipal Utility District. Her paternal grandfather was from a family of Eastern European Jews the original family surname being "Medwedof" who self-identified as Polish and Russian at the time of their arrival in the United States.
The focus was on entities and relationships and he introduced a diagramming representation for database design as well.
One of the early forms of ER diagrams, Bachman diagrams are named after him. Where are they used? Although they can be used to model almost any system they are primarily used in the following areas. They help to identify different system elements and their relationships with each other.
For example, an inventory software used in a retail shop will have a database that monitors elements such as purchases, item, item type, item source and item price.
Rendering this information through an ER diagram would be something like this: ER diagram example with entity having attributes In the diagram, the information inside the oval shapes are attributes of a particular entity.
There are more elements which are based on the main elements. Entity An entity can be a person, place, event, or object that is relevant to a given system. For example, a school system may include students, teachers, major courses, subjects, fees, and other items.
Entities are represented in ER diagrams by a rectangle and named using singular nouns.
Weak Entity A weak entity is an entity that depends on the existence of another entity. In more technical terms it can be defined as an entity that cannot be identified by its own attributes. It uses a foreign key combined with its attributed to form the primary key. An entity like order item is a good example for this.
The order item will be meaningless without an order so it depends on the existence of the order. Weak Entity Example in ER diagrams Attribute An attribute is a property, trait, or characteristic of an entity, relationship, or another attribute.
An entity can have as many attributes as necessary. Meanwhile, attributes can also have their own specific attributes. These are called composite attributes. Note that some top level ER diagrams do not show attributes for the sake of simplicity.
In those that do, however, attributes are represented by oval shapes. It is important to note that this is different from an attribute having its own attributes. For example, a teacher entity can have multiple subject values.
Example of a multivalued attribute Derived Attribute An attribute based on another attribute.View Homework Help - Rooms of the Home Writing Assignment from SPANISH N/A at South Lake High School, Groveland.
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Home > Standards > National Patient Safety Goals Below are links to the National Patient Safety Goals ® (NPSGs).
Included on each program's page is a link to download the chapter. Easy-to-read versions of the NPSGs are forthcoming. For frequently asked questions (FAQs) about the NPSGs, visit the Standards Interpretation .
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