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SQL join on multiple columns in same tables
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Join like this:
ON a.userid = b.sourceid AND a.listid = b.destinationid;
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count (non-blank) lines-of-code in bash
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cat foo.c | sed '/^\s*$/d' | wc -l
And if you consider comments blank lines:
cat foo.pl | sed '/^\s*#/d;/^\s*$/d' | wc -l
Although, that's language dependent.
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Ruby: Calling class method from instance
...le this is the right answer, it's a shame that "self.class" is more typing and less easy to read than the class name "Truck". oh well....
– Matt Connolly
Jan 11 '12 at 11:18
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How to break out or exit a method in Java?
...case, a return statement can be used to branch out of a control flow block and exit the method and is simply used like this:
return;
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How to pass data from 2nd activity to 1st activity when pressed back? - android
I've 2 activities, Activity1 and Activity2 .
9 Answers
9
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What's the best way to develop a sideswipe menu like the one in Facebook's new iOS app?
...ed into each iPhone app. Facebook has included it in their latest version and the new Gmail app appears to include it as well . I was wondering if anybody had thoughts on the most efficient way of developing something like this as it's becoming a more common interface element. While I have my o...
Convert Enum to String
... This deserves more attention. The obvious limitation notwithstanding, i.e. the requirement for compile-time input. In my opinion this should be preferred whenever possible. 'Rename' and 'find all references' take it into account as well, potentially avoiding magic strings and duplicate ...
CSS: How to have position:absolute div inside a position:relative div not be cropped by an overflow:
...to box #2, box #2 just need to be positioned. With this change, we get:
And here is the full code with this change:
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<style type="text/css">
/* Positioning */
#box1 { ...
How to get the error message from the error code returned by GetLastError()?
..... Win32 weirdness. Thanks for the heads up, fixed it in my own code base (and my answer). Very subtle catch.
– Jamin Grey
Jan 11 '14 at 1:45
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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
In JavaScript you can declare a variable and if it’s undefined , you can check variable == undefined ; I know that, but how can you compare a value that you don’t know yet if it’s in memory?
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