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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What is the TSQL syntax to format my output so that the column values appear as a string, seperated by commas. Example, my table CARS has the following: CarID CarName ---------------- 1 Porsche 2 Mercedes 3 Ferrari How do I get the car names as : Porsche, Mercedes, Ferrari 回答1: You can do a shortcut using coalesce to concatenate a series of strings from a record in a table, for example. declare @aa varchar (200) set @aa = '' select @aa = case when @aa = '' then CarName else @aa + coalesce(',' + CarName, '') end from Cars print @aa 回答2:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: The Use Case is that i have to move certain repositories to a new server. So these repositories get a new url. The Parent project which reference these sub-modules needs to be updated with the new url for the sub-module. I think of doing the following. update the .gitmodules file git submodule sync git submodule update commit and push But, since the previous commits have the earlier version of the .gitmodule, if i checkout a previous commit of the parent project - will it not look for the old server? To ensure reproducibility, we

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm running Ubuntu 11.04, Python 2.7.1 and wanted to install Pyaudio. So I ran, $ sudo easy_install pyaudio in the terminal and the process exited with following error messages, Searching for pyaudio Reading http://pypi.python.org/simple/pyaudio/ Reading http://people.csail.mit.edu/hubert/pyaudio/ Best match: pyaudio 0.2.4 Downloading http://people.csail.mit.edu/hubert/pyaudio/packages/pyaudio-0.2.4.tar.gz Processing pyaudio-0.2.4.tar.gz Running PyAudio-0.2.4/setup.py -q bdist_egg --dist-dir /tmp/easy_install-0Tetss/PyAudio-0.2.4/egg-dist

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to configure a console application with the following logging assemblies: Common.Logging.dll (2.1.0.0) Common.Logging.Log4Net1211.dll (2.1.0.0) log4net.dll (1.2.11.0) If the logger gets configured programmatically then everything works fine: NameValueCollection properties = new NameValueCollection(); properties["showDateTime"] = "true"; Common.Logging.LogManager.Adapter = new Common.Logging.Simple.ConsoleOutLoggerFactoryAdapter(properties); But if I try to launch it using the following configuration file, it blows up: <?xml

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Excited that Firebase's hosting is now out of beta. Trying to get going with with the firebase-tools package and I've successfully installed it: npm install -g firebase-tools Trying to run any tool fails with -bash: firebase: command not found I've tried putting the following command in my .bash_profile without any luck export PATH=/usr/local/share/npm/bin:$PATH Any ideas? Pretty new to the command line in general. Thanks! 回答1: @mklement0 That answer looks good, but I'm worried it will be intimidating to someone who is so new to the command

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to install NVM as per these instructions I typed in this command in terminal: $ curl https://raw.github.com/creationix/nvm/master/install.sh | sh After running the install, I restart the terminal and attempt to install Node.js with this command: $ nvm install 0.8 but I get the response: -bash: nvm: command not found I'm not sure what I am doing wrong here. Additional Info-- I've been looking around for solutions from other posts and forums. I found another solution using $ git clone git://github.com/creationix/nvm.git ~/.nvm but

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I was playing with the installation of Mongo db on my mac... and in exporting the Mongodb/bin dir to PATH .. looks like I corrupted the bash_profile and now I can't find it.. This is what I did : nano ~/. bash_profile The file did not exist, so I went ahead created one and added the following line export PATH ={ $PATH }:~ /mongo/ bin So now I saved the file .. by pressing ctrl + O and then hit Enter at the prompt. Then I pressed ctrl + X to exit nano. I reloaded my bash profile with the following command: $ source ~/. bash_profile

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I want to send 2d chunks of data using MPI_GATHER.For example I have 2x3 arrays on each node and I want 8x3 array on root, if I have 4 nodes. for 1d arrays MPI_GATHER sort data according MPI ranks but for 2d data it create mess!. What is the clean way to put chunks in order? I expected the output of this code: program testmpi use mpi implicit none integer :: send ( 2 , 3 ) integer :: rec ( 4 , 3 ) integer :: ierror , my_rank , i , j call MPI_Init ( ierror ) MPI_DATA_TYPE type_col ! find out process rank call MPI_Comm_rank ( MPI

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一、表展示 二、 练习题及答案 31. 找出有佣金的员工的不同工作，按降序排列 select job, comm from empgj where comm is not null order by comm desc; select job, comm from empgj where comm != 0 order by comm desc; SQL中判断非空（null）不能用等号，因为null在SQL中被看作特殊符号，必须使用关键字 is和not，如第一句所示 排序写法：order by +字段名+ 排序方式（asc/desc） asc：按升序排列，也是默认排序可省略不写 desc：按降序排列 32. 找出不收取佣金或收取的佣金低于500 的员工 select ename, comm from empgj where nvl(comm, 0) = 0 or comm < 500; 33. 找出各月倒数第3 天受雇的所有员工并且按月降序排序 select ename, hirdate from empgj where last_day(hiredate) - 2 = hiredate order by to_char(hiredate, 'mm') desc; 这里to_char()函数取出了雇佣日期的月份，因为在向表插数据时已经规定好了格式： insert into