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人类活动的整个历史,离不开对信息和数据的收集、保存、利用和处理。早期的电子计算机主要应用于数值计算领域,在数值计算中,数据的类型和结构都比较简单,程序设计的重点主要放在算法的表达方面。随着计算机技术的发展,计算机应用的领域不断扩大,计算机在数据处理上得到了广泛的应用,数据处理的特点是数量大,类型多,结构复杂。由于数据库系统能实现有组织地、动态
The entire history of human activities can not be separated from the collection, preservation, utilization and processing of information and data. Early computer mainly used in the field of numerical calculation, in the numerical calculation, the type and structure of the data are relatively simple, the main focus of programming on the expression of the algorithm. With the development of computer technology, the field of computer applications has been expanding. The computer has been widely used in data processing. The characteristics of data processing are numerous, many types and complex structures. Because the database system can be organized and dynamic