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How do I convert an interval into a number of hours with postgres?
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Probably the easiest way is:
SELECT EXTRACT(epoch FROM my_interval)/3600
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Rails find record with zero has_many records associated [duplicate]
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Bah, found it here: https://stackoverflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
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DbArithmeticExpression arguments must have a numeric common type
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edited Dec 14 '17 at 11:03
community wiki
7 r...
NSDictionary - Need to check whether dictionary contains key-value pair or not
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edited Dec 20 '17 at 6:18
Tony Adams
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Heroku + node.js error (Web process failed to bind to $PORT within 60 seconds of launch)
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1043
Heroku dynamically assigns your app a port, so you can't set the port to a fixed number. Herok...
“Origin null is not allowed by Access-Control-Allow-Origin” error for request made by application ru
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edited Apr 8 '12 at 16:00
answered Sep 19 '10 at 6:06
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RegEx for Javascript to allow only alphanumeric
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/^[a-z0-9]+$/i
^ Start of string
[a-z0-9] a or b or c or ... z or 0 or 1 or ... 9
+ one or more times (change to * to allow empty string)
$ end of string
/i case-insensitive
Update (supporting ...
Android: alternate layout xml for landscape mode
...amp-landscape-differeent-layouts and http://www.devx.com/wireless/Article/40792/1954 for some more options.
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File content into unix variable with newlines
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answered May 7 '10 at 14:44
paxdiablopaxdiablo
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XPath: How to select nodes which have no attributes?
...ath, how to select nodes which have no attributes (where attribute count = 0)?
3 Answers
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