Data Models: Data models describe how data is connected to each other and how that process and stored inside the system. Hierarchical Model: The hierarchical data model is like trees structurethat present data to users in tree structure. In hierarchical model each record looks like an organizational chart with one top level segment called root. The upper segments are connected logically to the lower segments like as parent and child relationship, and a parent segment can have many children but a child segment can have only one parent. In other words the hierarchical model design is that uses a one to many relationships or links anumber of disparate elements to owner or parent records. Network Model: Network model data allow the network …show more content…
There are several different levels of data modelling such as; • Conceptual data model • Logical data model • Physical data model Conceptual Data Model: Conceptual model is high level model that identifies the higher level relationship between different entities. . Its created by gathering all the business requirements from various sources like business analysts, discussion, documents, management experts and end users that do reporting on the database also its includes all major entities and relationships. Logical Data: Logical data describes the data in as much details as possible and it does include all entities and relationships among them. In logical data all attributes for each entity and the primary key and foreign keys are specified. Physical Data Model: Physical data model about how data will form in the database. . It will specify all the column and tables. This database shows all the structures of tables that include, column of data type, column of names, column of constrains, relationship between tables, primary key and foreign key. The foreign key is use to identify relationship between tables. Feature and …show more content…
Entities are representing by square or round corner. Entity Relation Diagram (ERDs): Entity relationship diagram is a design tool that represent the data system in graphical. ERDs provide a high level theoretical data model and composed of entities, attributes and relationships. A user has to connect a table with other tables to create a relationship between them. Entity attributes and identifiers: Entity attributes are property of an entity that can have any value from domain and they have any number of attributes. Database is used for to store information then user can use it when its need in order to achieve this task user has to identify each entity. Attributes can have different values than any other entity. There are two types of entity attributes; Transient and Persistent. Persistent attribute is persisted and derived from database whereas the value will not be persisted and derived in a transient attribute. Relationship types: there are three types of relationships One –to –one: In one-to-one relationship both side tables will have one record on both sides such as; Husband
The Data XML contains the data that needs to be added/updated to/deleted from the Database.
Internal schema at the internal level to describe physical storage structures and access paths, typically uses a physical data model.
of marriage that permits a person to have more than one husband or wife (Encyclopedia
There are two types of data. They are unstructured and multi-structured. Unstructured data comes from information that isn’t organized or easily interpreted by traditional databases or data models. This is usually in text format.
A model is a simplified representation of the structure and content of a phenomenon or system that describes or explains the complex relationships between concepts within the system and integrates elements of theory and practice (Creek et al 1993).
ERP software can assist with these requirements, limit errors, monitor information by double checking correct entry, set security features so that information is properly entered and is authorized. Enterprise Resource Planning (ERP) Enterprise resource planning (ERP) is a business management software that is utilized by enterprises to collect, store, manage and interpret data from all business activities that include: product planning cost, manufacturing or service industries, marketing/sales, inventory management and shipping and payments. EPR can be described as an enterprise-wide set of management tools that balance demand and supply by containing the ability to link customers and suppliers into a complete supply chain, employing proven business processes for decision-making and providing high degrees of cross-functional integration among sales, marketing, manufacturing, operations, logistics, purchasing, finance, and human resources (Wallace, 2001).
or married is said to be joined as husband and wife according to law or custom, or to take as
A database is a structured collection of data. Data refers to the characteristics of people, things, and events. Oracle stores each data item in its own field. For example, a person's first name, date of birth, and their postal code are each stored in separate fields. The name of a field usually reflects...
ASDA's Hierarchial Structure A hierarchical structure has many levels. Each level is controlled by one person. A hierarchical company tends to be a very big company just like ASDA is. In a hierarchical company, instructions are generally passed down from one person to another until it gets to the bottom.
“…Two persons who are neither married to each other nor civil partners of each other but are living together as husband and wife or as if they were civil partners…”
According to Thompson (2017), “a conceptual model or a conceptual framework represents abstract and general work that can guide research and practice. A conceptual model may be thought of as an early-stage of theory development.”
A model is a representation of a physical, structural, or conceptual object or concept. It is important to bear in mind that a model is not the object or concept itself, it is merely a representation of it. It is evident that there will be some noticeable differences or deviations between the object or concept and the model representing it, this will affect one’s understanding . A model is generally used to simplify the complex theory or object. An object would be simplified, and distorted, into a model to be used for symbolic positioning or to show a systematic process. The knower would only be confused if they were to try to comprehend the original complex object, therefore the simplified form of the object facilitates a better and faster
Concepts are determined by attributes and definitions of key terms. Relationships are determined by concepts, and data derived from the various source vocabularies.
There are different types of UML diagrams. Each UML diagram is designed to let developers and customers view a software system from a different perspective and in varying degrees of abstraction. UML diagrams commonly created in visual modeling tools include: use case diagram which displays the relationship among actors and use cases. Class case diagram models class structure and contents using design elements such as classes, packages and objects. It also displays relationships such as containment, inheritance, associations and others. Sequence diagram displays the time sequence of the objects participation in the interaction. This consists of the vertical dimension (time) and horizontal dimension (different objects). Collaboration diagram displays an interaction organized around the objects and their links to one another. Numbers are used to show the sequence of messages. State diagram displays the sequences of states that an object of an interaction goes through during its life response to received stimuli, together with its response and actions. Activity diagram displays a special state diagram where most of the states are action states and most of the transitions are triggered by completion of the actions in the source states. This diagram focuses on flows driven by internal processing.