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Add unique constraint to combination of two columns
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223
Once you have removed your duplicate(s):
ALTER TABLE dbo.yourtablename
ADD CONSTRAINT uq_your...
In HTML I can make a checkmark with ✓ . Is there a corresponding X-mark?
Is there a corresponding X mark to ✓ ( ✓ )? What is it?
4 Answers
4
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What regular expression will match valid international phone numbers?
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23 Answers
23
Active
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How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
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Standard C Preprocessor
$ cat xx.c
#define VARIABLE 3
#define PASTER(x,y) x ## _ ## y
#define EVALUATOR(x,y) PASTER(x,y)
#define NAME(fun) EVALUATOR(fun, VARIABLE)
extern void NAME(mine)(char *x);
$ gcc -E xx.c
# 1 "xx.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1...
Principal component analysis in Python
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edited Sep 3 '10 at 11:40
nikow
19.6k66 gold badges4242 silver badges6969 bronze badges
a...
Python, remove all non-alphabet chars from string
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123
Use re.sub
import re
regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, seco...
What's the meaning of * (asterisk) in XAML ColumnDefinition?
... <ColumnDefinition Width="0.07*"/>
<ColumnDefinition Width="0.93*"/>
</Grid.ColumnDefinitions>
The first column will get 7% of the total space available and the second column would get 93%. On the other hand if you had this definition:
<Grid.ColumnDefinitions>
<Col...
Iterating Through a Dictionary in Swift
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360
Dictionaries in Swift (and other languages) are not ordered. When you iterate through the dict...
How to match all occurrences of a regex
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834
Using scan should do the trick:
string.scan(/regex/)
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ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...4.1.0，不过影响没多大
2）解压源文件
tar zxf zeromq-4.0.3.tar.gz
3）进入zmq目录并进行编译和安装：
cd zeromq-4.0.3
./configure
make
make install
4）现在开始使用zmq进行网络通信
4.1接收端代码
//包含zmq的头文件
#include <zmq.h>
#inclu...