1

说明：  对数据库的增删改查，并有优美的前端界面，可以显示数据库的内容(Add, delete, modify and query the database, and has a beautiful front-end interface, which can display the contents of the database)

说明：  每组不超过4人，每人从TPC-H中选择至少三个查询进行执行，并进行性能调整。同组人员所选择的查询不能相同。各查询均必须包含：两个以上的表连接操作，其包含至少一个聚集函数。 每位同学的该作业均放在一个命名如“姓名-学号-专业-作业1”的目录中 用尽能想到的所有技术方法，使得选定的查询的某些性能指标尽可能的差 用尽能想到的所有技术方法，使得选定的查询的某些性能指标尽可能的好(Each group has no more than 4 people. Each person selects at least three queries from TPC-H to perform and performs performance adjustment. The queries selected by the same group can not be the same. Each query must contain more than two table join operations, which contain at least one aggregation function. Each student's homework is placed in a directory named "name student number professional operation 1". Using all the technical methods that can be thought of, make certain performance indicators of selected queries as poor as possible. Use all the technical methods that you can think of, and make certain performance indicators of selected queries as good as possible.)

数据库系统概念（第六版）教材答案，英文版。平时很多答案不完整，这里搜集了两份答案，互为补充，基本涵盖了所有题目。(The system concepts(6th) exercise answer.English version.There are two copies of answer,almost complete.)

本软件系本人自学VB过程中试写,后来经不断改进完成,经试用比较完整,又修补了一些漏洞,可以放心投入使用,并供学习编程爱好者参考. 本软件简单易用,操作方便,基本可以不用鼠标,直接通过键盘操作. ACCESS数据库+sql语句+VB6.0 数据库采用MD5加密 测试系统:WINDOWSXP(This software grades the course of my self-VB try to write, and later by the completion of continuous improvement, the more complete the trial, but also fixes some vulnerabilities, you can rest assured that put into use, and for enthusiasts to learn programming reference. This software is simple and easy to operate , the basic can be a mouse, directly through the keyboard. ACCESS database+ sql statement+ VB6.0 database using MD5 encryption test system: WINDOWSXP)

mysql-connector 5.1.32版本。。。。。。。(mysql-connector-java-5.1.32.jar)

hr人力资源系统 sqlserver数据库(hr human resources systems sqlserver database)

用VFP编写的报亭管理系统(VFP prepared by the newsstand Management System)

visual c++ 数据库技术,包括ODBC编程、 DAO编程、OLEDB编程、ADO编程四部分代码！很值得参考(visual c++ database technologies, including ODBC programming, DAO programming, OLEDB programming, ADO programming code four parts! Worth considering)

本文提出在数字移动通信中子带滤波器组处理可以提高不同阵元信号的相关性，从而能改善自适应阵列抑制码间干扰(ISI)和共信道干扰(CCI)的能力．在文[6]的基础上，本文研究了子带滤波器组在宽带自适应天线旁 瓣相消中的应用，对其原理进行了理论分析，提出了有效的子带处理方法．经研究表明，子带滤波器组处理能有效增加主、辅助天线信号的相关性，从而提高系统干扰相消比．而且适当的过采样能使系统干扰相消比进一步提高．计算机仿真结果和实测雷达数据处理结果证实了子带处理方法的有效性和理论分析的正确性．(err)

用于程序人员存放自己的各种代码的工具 1支持数据库备份和导入 2支持程序升级 3资料修改维护方便(For program staff kept their own tools for a variety of code to support one database backup and import 2 support escalation procedures to facilitate the maintenance of 3 data modification)