Chapter 11 Database Management 11.1 Overview a data base consists of a file or a set of files The informationin these files may be broken down into records, each of which consists of one or more fields. Fields are the basic units of data storage, and each field typically contains information pertaining to one aspect or attribute of the entity described by the database. Using keywords and various sorting commands, users can rapidly search, rearrange, group, and select the fields in many records to retrieve or create reports on particular aggregates of data. 一个数据库由一个文件或文件集合组成。这些文件中的信息可分解成一个 个记录,每个记录有一个或多个域。域是数据存储的基本单位,每个域 般含有由数据库描述的属于实体的一个方面或一个特性的信息。用户使用 键盘和各种排序命令,能够快速查找、重排、分组并在查找的许多记录中 选择相应的域,建立特定集上的报表。 《什第机专出美语 15Chapter 11 Database Management 计算机专业英语 11-5 A database consists of a file or a set of files. The information in these files may be broken down into records, each of which consists of one or more fields. Fields are the basic units of data storage, and each field typically contains information pertaining to one aspect or attribute of the entity described by the database. Using keywords and various sorting commands, users can rapidly search, rearrange, group, and select the fields in many records to retrieve or create reports on particular aggregates of data. 一个数据库由一个文件或文件集合组成。这些文件中的信息可分解成一个 个记录，每个记录有一个或多个域。域是数据存储的基本单位，每个域一 般含有由数据库描述的属于实体的一个方面或一个特性的信息。用户使用 键盘和各种排序命令，能够快速查找、重排、分组并在查找的许多记录中 选择相应的域，建立特定集上的报表。 11.1 Overview