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Postgresql aggregate array
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163
Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as mark...
How to check an Android device is HDPI screen or MDPI screen?
...rces().getDisplayMetrics().density;
// return 0.75 if it's LDPI
// return 1.0 if it's MDPI
// return 1.5 if it's HDPI
// return 2.0 if it's XHDPI
// return 3.0 if it's XXHDPI
// return 4.0 if it's XXXHDPI
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How to get an outline view in sublime texteditor?
...TRL+R, or CMD+R for Mac, for the function list. This works in Sublime Text 1.3 or above.
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How to add 10 days to current time in Rails
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Use
Time.now + 10.days
or even
10.days.from_now
Both definitely work. Are you sure you're in Rails and not just Ruby?
If you definitely are in Rails, where are you trying to run this from? Note that Active Support has to be loaded.
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PHP filesize MB/KB conversion [duplicate]
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12 Answers
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How can I unstage my files again after making a local commit?
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git reset --soft HEAD~1 should do what you want. After this, you'll have the first changes in the index (visible with git diff --cached), and your newest changes not staged. git status will then look like this:
# On branch master
# Changes to be ...
javax.xml.bind.UnmarshalException: unexpected element (uri:“”, local:“Group”)
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14 Answers
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Boolean.hashCode()
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141
1231 and 1237 are just two (sufficiently large) arbitrary prime numbers. Any other two large p...
Comparing two collections for equality irrespective of the order of items in them
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19 Answers
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What is the difference between Step Into and Step Over in the Eclipse debugger?
...STEP INTO
}
static void g (int x) {
-> f(x); //
f(1); // <----------------------------------- STEP OVER
}
public static void main (String args[]) {
g(2);
g(3); // <----------------------------------- STEP OUT OF
}
}
If you were to step in...