Power network has the characteristic of hierarchical so that we should think of making use of it to represent the power system data model 电网具有层次性特点,因此,对电网数据模型的表示就应当充分利用电网的层次性。
This step is to identify and describe the structure of the system data , independently of the way the data is currently held and organized 这个步骤是要以不受目前储存及组织数据的方式影响,来认定及描述系统数据的结构。
The school year system data attribute is unitary while the credit system data attribute is multiplex by analyzing the data element attribute 摘要从数据元素的属性上分析,学年制的数据属性比较单一,学分制的数据属性具有多样性。
Supplying a value in a sql server system data type , as long as the user - defined type supports implicit or explicit conversion from that type 提供sql server系统数据类型的值,条件是该用户定义类型支持该类型的隐式转换或显式转换。