免费智能真题库 > 历年试卷 > 数据库系统工程师 > 2019年上半年 数据库系统工程师 上午试卷 综合知识
第73题      2019年上半年 数据库系统工程师 上午试卷 综合知识
所属知识点   计算机专业英语       

 
The entity-relationship (E-R) data model is based on a perception of a real world that consists of a collection of basic objects, called (71),and of relationships among these objects. An entity is a “thing” or “object” in the real world that is distinguishable from other objects. Entities are described in a database by a set of (72) . A relationship is an association among
several entities. The set of all entities of the same type and the set of all relationships of the same type are termed an entity set and relationship set, respectively. The overall logical structure (schema) of a database can be expressed graphically by an E-R diagram, which is built up from the following components: (73) represent entity set, (74) represent attributes, etc. In addition to entities and relations, the E-R model represents certain(75) to which the contents of a database must conform. The entity-relationship model is widely used in database design.
 
 
  A.  rectangles
 
  B.  ellipses
 
  C.  diamonds
 
  D.  lines
 
 
 

  计算机专业英语 知识点 更多相关真题:    更多>  
 
  第72题    2012年上半年  
   75%
At a basic level, cloud computing is simply a means of delivering IT resources as (71). Almost all IT resources can be delivered as a cloud service: applications, compute power, st..
  第75题    2018年上半年  
   57%
A transaction is an action, or a series of actions, carried out by a single user or (71), that accesses or changes the contents of the database.
A transaction should possess t..
  第71题    2019年上半年  
   63%
The entity-relationship (E-R) data model is based on a perception of a real world that consists of a collection of basic objects, called (71),and of relationships among these ob..
 


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↓第73题