record. It includes students of the school, name, sex, nationality, date of birth,
performance data items. These data items can be divided into two types : one called
early such as student gender, origin, etc., these data were no longer divided in data
processing, the smallest units; Another called portfolio, the performance of students
who, it can be divided into mathematics, physics, chemistry and other smaller items.
Normally, in addressing the question of the practical application of each student is
recorded as a basic unit for a visit and treatment.
Data objects (Data Object) or data element type (Data Element Class) is the
nature of the data elements with the same pool. In a specific issue, the data elements
have the same nature (not necessarily equal value elements), belonging to the same
data objects (data element type), the data element is an example of such data elements.
For example, traffic information systems in the transportation network, is a
culmination of all the data elements category, peak a and B each represent an urban
middle is the data elements of the two types of examples of the value of their data
elements a and B respectively.
Data structure (Data Structure) refers to the mutual relationship that exists
between one or more data elements together. In any case, between data elements will
not be isolated in between them exist in one way or another, such as the relationship
between the data element structure. According to the data elements of the relationship
between different characteristics, usually have the following four basic categories of
the structure :
1 assembly structures. In the assembly structure, the relationship between data
elements is "belonging to the same pool." Assembly elements relations is a very loose
structure.
2 linear structures. The structure of the data elements exist between one-to-one
relationship.
3 tree structure. The structure of the data elements exist between hierarchical
relationship.
4graphics structure. The structure of the data elements of the relationship that
existed between Duoduiduo, graphics structure also known as network structure.
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