2. 计算机
  3. During the systems analysis phase，you must decide how data will be organized，stored，and managed. A (71)________ is a framewor

During the systems analysis phase，you must decide how data will be organized，stored，and managed. A (71)________ is a framewor

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问题 During the systems analysis phase，you must decide how data will be organized，stored，and managed. A  (71)________  is a  framework for organizing，storing，and managing data.Each file or table contains data about people，places，things，or events．One of the potential problems existing in a file processing environment is  (72)________，which means that data common to two or more information systems is stored in several places．In a DBMS，the linked tables form a unified data structure that greatly improves data quality and access．A(n)(73)________  is a model that shows the logical relationships and interaction among system entities．It provides all overall view of the system and a blueprint for creating the physical data structures．(74)________ is the process of creating table designs by assigning specific fields or attributes to each table in the database．A table design specifies the fields and identifies the primary key in a particular table or file．The three normal forms constitute a progression in which  (75)________  represents the best design．Most business-related databases must be designed in that form．
(73)
选项 A、entity-relationship diagram
B、data dictionary
C、database schema
D、physical database model
答案A
解析
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