Logical Data Modeling - Optionality (NOT NULL)

Data System Architecture


The Optionality is a property of an attribute which specify if a value is mandatory or optional. Often, this rule is applied with a NOT NULL clause in the database.

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Testing Infrastructure
Code - Testing (Software Quality Assurance|SQA|Validator|Checker)

A test is performed to verify that the system is conformed to the specification and is the most important part of code quality. In a “Test-driven_developmenttest-driven software development (tdd)”...
Data System Architecture
Data Type - Null Value

Every data type includes a special value, called the null value, sometimes denoted by the keyword NULL that reflects the optionality character of the value. The data type of the null value implied by...
Data System Architecture
Logical Data Modeling - Attribute

An attribute is a property or characteristic of a primary element (entity, relationship) one-to-one colorentity... The values for each attribute are defined in terms of properties. An attribute is...

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