Query 　　In database management ,a search question that tells the program what kind of data should be retrieved from the database .An effective database management system lets you retrieve only the information you need for a specific purpose .A query specifies the characteristics (criteria) used to guide the computer to the required information. 　　查询 　　在数据库管理中,告诉程序应从数据库检索何种数据的一种检索问题。一个有效的数据库管理系统使你仅检索特定目标的信息。查询规定了用来引导计算机至所需要信息的特征(条件)。 　　Query By Example (QBE) 　　In database management programs ,a query technique ,developed by IBM for use in the QBE program ,that prompts you to type the search criteria into a template resembling the data record .The advantage of query-by-example retrieval is that you don’t need to learn a query language to frame a query .When you start the search ,the program presents a screen that lists all the data fields that appear on every data record ;enter information that restricts the search to just the specified criteria .The fields lift bland ,however ,will match anything. 　　按例查询 　　在数据库管理程序中,由IBM开发的用于QBE程序的一种查询技术,提示你将检索条件键入一个类似的数据记录的模板中。按例查询检索的优点在于你不需要学习查询语言来构建查询。当你开始检索时,程序便展示出一个屏幕,列出出现在每个数据记录中的数据段;输入将检索限制在仅为规定条件的信息。然而剩下的空白字段将可匹配任何内容。 　　Query Language 　　In database management programs ,a retrieval and data-editing language you use to specify what information to retrieve and how to arrange the retrieved information on-screen or when printing .The dot-prompt language of dBASE is a full-fledged query language ,as is Structured Query Language (SQL) ,which is used for minicomputer and mainframe databases and is growing in popularity in the world of personal computers .The ideal query language is a natural language ,such as English. 　　查询语言 　　在数据库管理程序中,用来规定检索何种信息以及屏幕上如何安排检索信息或何时打印的一种检索和数据编辑语言。dBASE的点提示符语言是非常成熟的查询语言,如结构化查询语言(SQL),这种语言用于小型机和大型机数据库,并且正在个人机领域普及。理想的查询语言是自然语言,如英语。 By 5ai9.com-->