大约有 15,510 项符合查询结果（耗时：0.0226秒） [XML]
Does a UNIQUE constraint automatically create an INDEX on the field(s)?
... you should not worry about them until you actually run into them.
As for testing index usage you should first fill your table with some data to make optimizer think it's actually worth to use that index.
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C Macro definition to determine big endian or little endian machine?
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Test the endianness with #if __BYTE_ORDER == __LITTLE_ENDIAN and #elif __BYTE_ORDER == __BIG_ENDIAN. And generate an #error elsewise.
– To1ne
May 4 '11 at 7:43
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How to pretty print XML from the command line?
...nt. Example: "C:\Program Files\Git\usr\bin\xmllint.exe" --format QCScaper.test@borland.com.cds.xml > QCScaper.test@borland.com.pretty-printed.cds.xml
– Jeroen Wiert Pluimers
Dec 21 '17 at 7:46
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filter for complete cases in data.frame using dplyr (case-wise deletion)
...## ..- attr(*, "names")= chr "3" "4"
ADDED Have updated to reflect latest version of dplyr and comments.
ADDED Have updated to reflect latest version of tidyr and comments.
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WKWebView in Interface Builder
...then use it in interface builder.. but without super.initWithCoder.. let's test ! :)
– zarghol
Mar 9 '15 at 22:23
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Set the maximum character length of a UITextField
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There really is an undo bug as @bcherry mentions – tested with UITextField on iPad iOS 8.1. (+1 to comment). Would the author add something about this as it's the top rated answer? I'm happy to do an edit, but mine regularly seem to get rejected! :-)
– B...
How to refer to relative paths of resources when working with a code repository
...ath.dirname(os.path.abspath(__file__))
thefile = os.path.join(package_dir,'test.cvs')
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Check time difference in Javascript
...diff.getMinutes() + " Minutes " + date_diff.getSeconds() + " Seconds";
}
Tested in the Google Chrome console (press F12)
get_time_diff()
1388534523123 1375877555722
"146 Days 12 Hours 49 Minutes 27 Seconds"
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How to delete items from a dictionary while iterating over it?
...ct.keys() to a list by list(mydict.keys()) and it should work.
A simple test in the console shows you cannot modify a dictionary while iterating over it:
>>> mydict = {'one': 1, 'two': 2, 'three': 3, 'four': 4}
>>> for k, v in mydict.iteritems():
... if k == 'two':
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Advantages to Using Private Static Methods
...because they break polymorphism, and mean the object cannot be stubbed for testing. for example see googletesting.blogspot.co.uk/2008/12/…
– Andy
Jul 16 '15 at 10:22
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