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Add unique constraint to combination of two columns

...g an exception (exceptions are expensive). http://www.sqlperformance.com/2012/08/t-sql-queries/error-handling http://www.mssqltips.com/sqlservertip/2632/checking-for-potential-constraint-violations-before-entering-sql-server-try-and-catch-logic/ If you want to prevent exceptions from bubbling up ...
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Bash Script: count unique lines in file

... 306 You can use the uniq command to get counts of sorted repeated lines: sort ips.txt | uniq -c ...
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Ruby: Merging variables in to a string

... answered Feb 16 '09 at 21:42 Mike WoodhouseMike Woodhouse 47.6k1212 gold badges8585 silver badges123123 bronze badges ...
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How to do version numbers? [closed]

...e "unstable watchout" on there. So how would you go about versioning? Is 1.0 stable? Should the build date be in the version number? Tell me what you guys think! ...
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Sass negative variable value?

... Try it like this margin: 0 (-$pad) 20px (-$pad); share | improve this answer | follow | ...
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how to find host name from IP with out login to the host

... Use nslookup nslookup 208.77.188.166 ... Non-authoritative answer: 166.188.77.208.in-addr.arpa name = www.example.com. share | improve this ...
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Overlaying histograms with ggplot2 in R

... Your current code: ggplot(histogram, aes(f0, fill = utt)) + geom_histogram(alpha = 0.2) is telling ggplot to construct one histogram using all the values in f0 and then color the bars of this single histogram according to the variable utt. What you want instead is...
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Can I use `pip` instead of `easy_install` for `python setup.py install` dependency resolution?

...ip install https://pypi.python.org/packages/source/r/requests/requests-2.3.0.tar.gz Install from local tarball wget https://pypi.python.org/packages/source/r/requests/requests-2.3.0.tar.gz pip install requests-2.3.0.tar.gz Install from local folder tar -zxvf requests-2.3.0.tar.gz cd requests-2...
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Emulating a do-while loop in Bash

... answered May 10 '13 at 19:59 jm666jm666 51k1414 gold badges8585 silver badges155155 bronze badges ...
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Determine .NET Framework version for dll

...t the source code because I believe it has been upgraded to Visual Studio 2008 and changed to .NET framework version 3.5. 1...