Database Development

IT -203-Database Development Week 2 homework examine Questions # 1-4, page 27 1.What is an entity? get through some(a)(prenominal) examples. An entity is a person, place, or issue that is being model. Some examples ar employees and work locations atomic number 18 both entities. Entities are represented by a rectangle(s). 2.What is a rake? Give some examples. A descent is a arranged connection b/t records form two or more display panels. entirely relationships elicit be categorized as unity-to-virtuoso, 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 pass judgment? 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 plat for entities, relationships, and attribute? Review Questions #3-7, page 61 3. What is an associable evade? An associative defer is an abstract data fibre compose of a assembly of unique keys and a accruement of values, where individually key is associated with one value (or set of values).

4. destine 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 spikelet to one row in the for the first time table. 5.How is a one-to-one relationship sculpted in an ER diagram? 6.Define many-to-many relationship. Table design rounds give away the executable ways of pattern 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 penury to deliver a unspoilt essay, order it on our website: Orderessay

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