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Unique constraint that allows empty values in MySQL

I have a <em>fem>ield that stores product codes. The codes are unique, but some products simply doesn't have a code. I can't invent codes because those are providers codes. ...
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Insert the carriage return character in vim

I'm editing a network protocol <em>fem>rame stored a <em>fem>ile in Unix ( \n newlines). I need to insert the carriage return character ( U+000D aka \r ). When I try to paste it <em>fem>rom the clipboard ( "+p ) or type it using Ctrl + Shi<em>fem>t + u - 000d , the line<em>fem>eed is inserted ( U+000A ). ...
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Django <em>fem>ix Admin plural

How do I change some models name <em>fem>rom "Categorys" to "Categories" on admin site in the new dev django version? In the old version (whithout admin sites and admin models) you could just do this; http://www.the-dig.com/blog/post/customize-plural-name-django-admin/ ...
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How can I append a string to an existing <em>fem>ield in MySQL?

I want to update the code on all my record to what they currently are plus _standard any ideas? 2 Answers ...
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How do you receive a url parameter with a spring controller mapping

This issue seems trivial, but I can't get it to work properly. I'm calling my Spring controller mapping with jquery ajax. The value <em>fem>or someAttr is always empty string regardless o<em>fem> the value in the url. Please help me determine why. ...
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Eclipse: Can you <em>fem>ormat code on save?

In Eclipse, under Windows -> Pre<em>fem>erence -> Java -> Code Style , you can de<em>fem>ine code templates <em>fem>or comments and code, and you can setup a code <em>fem>ormatter. ...
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How to change the de<em>fem>ault <em>fem>ont size in ggplot2

I'd like to know i<em>fem> it is possible to change some de<em>fem>ault parameters o<em>fem> ggplot2 graphics, like <em>fem>ont size <em>fem>or instance, <em>fem>or a whole R session. The idea is to avoid setting them <em>fem>or <em>eacem>h plot. ...
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what does npm -D <em>fem>lag mean?

I am about to install this npm package and it says npm install -D load-grunt-con<em>fem>ig , what does the -D <em>fem>lag do? 3 Answer...
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Javadoc: package.html or package-in<em>fem>o.java

When trying to create package level Javadoc comments, whats the pre<em>fem>erred method? What do you do? 1 Answer ...
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Using current time in UTC as de<em>fem>ault value in PostgreSQL

I have a column o<em>fem> the TIMESTAMP WITHOUT TIME ZONE type and would like to have that de<em>fem>ault to the current time in UTC. Getting the current time in UTC is easy: ...