Let the following relational tables be given: R = (A, B, C) and S = (D, E, F) where A, B, C, D, E, and F are the attributes (columns). Write the SQL statements that will express each of the queries given below:
标签: relational following tables given
上传时间: 2014-01-14
上传用户:cx111111
SOPC实验--自定义PWM组件:以带一个Avalon Slave 接口的PWM 组件为例,说明如何自定义组件。,一个Avalon Slave 接口可以有clk、chipselect、address、read、readdata、write 及writedata 等信号,但这些信号都不是必需的。 一、功能 我们要实现的PWM 组件具有以下功能: 1. PWM 的周期可改,用period 寄存器存储; 2. PWM 的占空比可改,用duty 寄存器存储。 二、Avalon Slave 接口信号的设计 1.Clk:为PWM 提供时钟; 2.Write:写信号,可以通过Avalon Slave 总线将period 和duty 值从Nios II 应用程序 传送到组件逻辑中。 3.Writedata:写数据。通过此数据线传送period 和duty 值。 4.Address:本例中有两个寄存器,因此可用一根地址线表示。 5.全局信号。本例中PWM 的输出用来驱动LED 灯显示,这个信号不属于Avalon 接 口信号。
上传时间: 2013-12-28
上传用户:bibirnovis
为LINUX设计一个简单的二级文件系统。要求做到以下几点: 1、 可以实现下列几条命令 Login 用户登录 Dir 列文件目录 Create 创建文件 Delete 删除文件 Open 打开文件 Close 关闭文件 Read 读文件 Write 写文件 2、列目录时要列出文件名、物理地址、保护码和文件长度。 3、源文件可以进行读写保护。
上传时间: 2016-07-16
上传用户:jeffery
三星公司官方JTAG下载工具SJF2440源代码下载。SJF2440 can program SMDK2440 flash memory (K9S1208,Intel E28F128,AMD29LV800BB) through JTAG port and read/write data from/to a specified address.
上传时间: 2014-01-20
上传用户:脚趾头
.ifnz I2C_SUPPORT ************************************************************** Function : fProcessI2cRead Description : process I2C write function Input : IOP_DATA1_H=rCtrlByte,IOP_DATA1_L=rAddr Output : NONE ************************************************************** fProcessI2cRead: fetch parameter lda IOP_DATA1_H sta rCtrlByte lda IOP_DATA1_L sta rAddr jsr fI2cSendCmdAddr bcs lReadI2CFail
标签: C_SUPPORT Function ifnz fPro
上传时间: 2016-07-21
上传用户:xaijhqx
MT: windows NT/2000/XP command line tape manipulation written to format a tape windows-XP backup refused to write or format... and satisfy my curiosity Can be used for crude data recovery (combine seek and read)
标签: tape manipulation windows-XP windows
上传时间: 2013-12-23
上传用户:tb_6877751
Over the past years, we have witnessed destructions of various kinds caused by human actions. As a university student, write a letter to our society to
标签: destructions witnessed actions various
上传时间: 2014-11-23
上传用户:一诺88
C++ Footprint and Performance Optimization contains case studies and sample code to give readers concrete examples and proven solutions to problems that don t have cut and paste solutions. The market for miniature computer programming is exploding. C++ Footprint and Performance Optimization supplies programmers the knowledge they need to write code for the increasing number of hand-held devices, wearable computers, and intelligent appliances. This book gives readers valuable knowledge and programming techniques that are not currently part of traditional programming training.
标签: Optimization Performance Footprint and
上传时间: 2014-01-06
上传用户:杜莹12345
socket编程原理:UNIX系统的I/O命令集,是从Maltics和早期系统中的命令演变出来的,其模式为打开一读/写一关闭(open-write-read- close)。在一个用户进程进行I/O操作时,它首先调用“打开”获得对指定文件或设备的使用权,并返回称为文件描述符的整型数
上传时间: 2016-08-12
上传用户:懒龙1988
delphi 写的delphi的程序 Handel is a free, standalone development tool created with Delphi 3 that enables you to create, compile, and run projects. Handel also supports Form Design Environments such as Delphi and can open and write units, projects, and forms created with Delphi 2 or 3. However, it is not perfectly compatible with Delphi.
标签: delphi development standalone created
上传时间: 2014-01-18
上传用户:jing911003