大约有 40,000 项符合查询结果（耗时：0.0707秒） [XML]
SQL server query to get the list of columns in a table along with Data types, NOT NULL, and PRIMARY
I need to write a query on SQL server to get the list of columns in a particular table, its associated data types (with length) and if they are not null. And I have managed to do this much.
...
Python syntax for “if a or b or c but not all of them”
I have a python script that can receive either zero or three command line arguments. (Either it runs on default behavior or needs all three values specified.)
...
SQL Developer is returning only the date, not the time. How do I fix this?
...
Active
Oldest
Votes
...
Dynamically select data frame columns using $ and a character value
I have a vector of different column names and I want to be able to loop over each of them to extract that column from a data.frame. For example, consider the data set mtcars and some variable names stored in a character vector cols . When I try to select a variable from mtcars using a dynamic s...
What is the alternative for ~ (user's home directory) on Windows command prompt?
I'm trying to use the command prompt to move some files,
I am used to the linux terminal where I use ~ to specify the my home directory
I've looked everywhere but I couldn't seem to find it for windows command prompt ( Documents and Settings\[user] )
...
设置用户默认权限 Umask命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
shell> umask
0022
注：0022等价于022，0022中第一个0用于sticky-bit，本文不做讨论，有兴趣的请自查。
为了稍后演示的方便性，先在Windows上用7-zip创建两个文件：
foo.zip（包括：目录foo_dir，文件foo_file）
bar.tar（包括：目录bar_dir...
CSS counter-increment 属性经典详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
CSS counter-increment 属性经典详解CSS Counters其实就是css的计数器，灵活使用它就能仅用css解决很多编号等问题，而非写逻辑代码搞定。下面通过两个实例详解它的用法：<!DOCTY...CSS Counters其实就是css的计数器，灵活使用它就能仅用css...
nsis安装、卸载时如何判断程序是否正在运行 并提示关闭？ - 更多技术 - 清...
...关闭？;--------------------------------------------------------------!include logiclib.nshFindProcDLL::FindProc "Test.exe"StrCmp $R0...
;--------------------------------------------------------------
!include logiclib.nsh
FindProcDLL::FindProc "Test.exe"
StrCmp $R0 1 0 +2
messagebox::show ...
linux 通过bind下搭建DNS Server - 更多技术 - 清泛网 - 专注C/C++及内核技术
linux 通过bind下搭建DNS Serverconfig-dns-server-on-linux-var-bind作为一个web开发人员，开发过程中肯定有很多项目需要分配不同的域名来访问，这样避免一个localhost不够用和避免加端口各种麻烦，以及子目录...作为一个web开发人员，开发...
h5页面在手机端禁用横向滚动 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...还是能滑动一小段距离，很影响体验，网上有通过js 和 css阻止触摸滑动事件的，感觉还是不太优雅，最后找出原来通过简单的css就能解决， 有时手机页面样式都调整好以后，发现左右还是能滑动一小段距离，很影响体验，网...