英语翻译 In a well-desigined database,there are no dupli

英语翻译
 In a well-desigined database,there are no duplicate data the user or application must update at the same time
 To work with data in a database,you have to use a set of commands and statements(language)defined by the DBMS software
 Generic database applications can use the catalog to present users with data from different databases dynamically,without being tied to a specific data format
 Electronic commerce is a system that includes not only transactions that center on buying and selling goods and services to directly generate revenue,but also transactions that support revenue generation
 Electronic commerce builds on the advantages and structures of traditional commerce by adding the flexibilities offered by electronic networks
 As another example,AMP Inc.is offering its clients the opportunity to purchase electronic connectors and related components directly from its Web-based catalog,bypassing the need for EDI-based purchase orders and confirmations