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How to create a unique index on a NULL column?
I am using SQL Server 2005. I want to constrain the values in a column to be unique, while allowing NULLS.
4 Answers
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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won't deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be P...
Android Spanned, SpannedString, Spannable, SpannableString and CharSequence
Android offers a variety of interfaces all related to text and strings:
Spanned , SpannedString , Spannable , SpannableString and CharSequence .
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Deep copying an NSArray
Is there any built-in function that allows me to deep copy an NSMutableArray ?
6 Answers
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Are database triggers evil? [closed]
Are database triggers a bad idea?
20 Answers
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What is the best way to force yourself to master vi? [closed]
A good while ago, I read an article by the creator of viemu , clearing up a lot of the misconceptions about vi, as well as explaining why it's a good idea (and why it's been very popular for the last 30 years+). The same guy also has a great set of graphical cheat sheets that teach the basics a f...
How do I reference a javascript object property with a hyphen in it?
Using this script to make a style object of all the inherited etc styles.
11 Answers
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How can I render a list select box (dropdown) with bootstrap?
Is there anything out of the box that bootstrap supports to render a "regular" defacto drop down list select box? That is, where the drop down box is a list of values and if selected populate the contents of the list box?
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Why should I use a semicolon after every function in javascript?
I've seen different developers include semicolons after functions in javascript and some haven't. Which is best practice?
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What does the “__block” keyword mean?
What exactly does the __block keyword in Objective-C mean? I know it allows you to modify variables within blocks, but I'd like to know...
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