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75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.  things
 
  B.  objects
 
  C.  conditions
 
  D.   constrains
 
 
 

  计算机专业英语 知识点 更多相关真题:    更多>  
 
  第71题    2013年上半年  
   64%
So it is today.Schedule disaster, functional misfits,and system bugs all arise because the left hand doesn't know what the right hand is doing.As work (71),the several teams slow..
  第74题    2019年上半年  
   65%
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..
  第74题    2013年上半年  
   65%
So it is today.Schedule disaster, functional misfits,and system bugs all arise because the left hand doesn't know what the right hand is doing.As work (71),the several teams slow..
 


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