In any given business environment the role of logical database design is to ensure that attributes of the entities which are imperative to the business model are arranged in a structural manner so that a relational database can be obtained from the latter. In a nutshell the arranging of the said attribute is fundamentally what a Logical Database is at its core and the objective of doing so is to reflect the company’s environment.
One to One Binary Relationships
In any relational database one to one binary relationship corresponds to a single entity which may be housed in a given row while that row is linked to only one other row in the entire database. This linking of two entities does not in any way correspond to the property of the data however the commonality which binds them together is their relationship. For example, the capital city entry in any databased is linked to the country of origin.
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One to Many Binary Relationships
A One to Many relationship corresponds to one particular row in a given table being linked to multiple rows in another corresponding table. The conceptualization of One to Many is similar to One to One binary relationships in which the property of the data does not influence the relationship of the data within both tables. An example of One to Many Binary relationships is the housing of records of authors in Table A and then linking it to the number of books written in Table B by the same said author.
Many to Many Binary Relationships
In a many to many relational database record a single entity or record is linked to multiple records which are correspondingly linked to more records and vice versa. Such relationships are usually implemented by means of an associative table or junction table / cross-reference table and primary keys are assigned to each original value or data point.
One to One Unary Relationship
A One to One Unary relationship is when a record and the entity belong to one singular piece of data and are part of the same larger entity. For example, prerequisites for a course in a University could have a One to One Unary Relationship with the overall curriculum of the degree program.
