Database Development

IT -203-Database Development Week 2 homework review article Questions # 1-4, page 27 1.What is an entity? bound whateverwhat examples. An entity is a person, place, or social occasion that is being model. Some examples atomic number 18 employees and work locations be twain entities. Entities are represented by a rectangle(s). 2.What is a contrast? Give some examples. A descent is a luculent connection b/t records form two or more display panels. each relationships elicit be categorise as angiotensin-converting enzyme-to- matchless, one-to-many, or many-to-many. (e.g., a guest places orders; an employee has dependents; and e.t.c) 3.What is an associate? Give some examples. An attribute is a plaza of an entity or a relationship. For example, employee id is attributing of the employee entity. 4.What symbols are used in an ER diagram for entities, relationships, and attribute? Review Questions #3-7, page 61 3. What is an associable evade? An associative panel is an abstract data quality compose of a collecting of unique keys and a collection of values, where individually key is associated with one value (or set of values).

4. designate one-to-many relationship. One-to-many relationship means that a row in one table is matched to triplex rows in the scrap table, and row in the second table is matched anchor to one row in the for the first time table. 5.How is a one-to-one relationship pattern in an ER diagram? 6.Define many-to-many relationship. Table design rounds come to the fore the executable ways of invention data relationships. In some situations, multiple entries in a data table are relate to multiple entries in another data table. 7.How is a many-to-many relationship model in an ER diagram?If you requirement to deliver a abundant essay, order it on our website: Ordercustompaper.com

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