be cpu sequence and the hard drive Xu Lei good and simple encryption algorithm!

PostGIS 是一个开源程序，它为对象－关系型数据库PostgreSQL提供了存储空间地理数据的支持，使PostgreSQL成为了一个空间数据库，能够进行空间数据管理、数量测量与几何拓扑分析。PostGIS 实现了Open Geospatial Consortium所提供的Simple Features的SQL实现参考。

源树b，b树结构，删除，插入，相当于搜索，搜索功能的范围

《学籍管理系统》 “c# WinForm 数据库操作的简单范例 （SQL Server 2000）”-"expulsion management systems," "c# WinForm operation of the database simple paradigm (SQL Server 2000)"

数据结构演示系统-data structure Demonstration System

数据算法，小明买书-data algorithm, Xiao Ming books

VB开发数据库系统 VB程序实例 内含工厂系统 学生系统等-VB database system containing examples of plant systems such as the students

约瑟夫环源代码,前中后序递归遍历二叉树-Josephus source code, before, during and after recursive traversal sequence binary tree

含并、交和差运算的集合类型试验报告，这个报告是做计算机试验的标准样式，分为了7个模块。-containing, intersection and poor computing pool type test report, the report is made to the standard computer test pattern, divided into seven modules.

由于计算机存储的限制，当其所存储的数大于32位时，就会有溢出，该程序只要是实现大数加法 减法 乘法。-computer storage limitations, when it stored more than 32 a few hours, there will be a spillover, The procedure is as long as the majority addition subtraction multiplication.

数据库设计指南，数据库的教程- Database design guide, database course