大约有 46,000 项符合查询结果（耗时：0.0682秒） [XML]
Nullable Foreign Key bad practice?
... read.
Only if you know better than Chris Date "what first normal form really means". If x and y are both nullable, and indeed in some row x and y are both null, then WHERE x=y does not yield true. This proves beyond reasonable doubt that null is not a value (because any real value is always equ...
reformat in vim for a nice column layout
...ion for this.
Locate to the longest word and place cursor after it.
Remove all the extra whitespace using dw and vertical movement.
Example of this technique demonstrated below:
I don't find myself needing to align things often enough to install another plugin, so this was my preferred way of a...
How to change background color in android app
... but isn't it easier just to use the hex value?
– the_prole
Jun 21 '14 at 9:31
it would be very easy, but bad practice...
Maven error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher
I have installed a latest maven-3.0.4 on Windows 7 :
The installation details are as follows:
Installation Path :
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Correct way to pass multiple values for same parameter name in GET request
...s multiple values from this example at w3schools.
<form action="/action_page.php">
<select name="cars" multiple>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi"...
How to loop through an associative array and get the key? [duplicate]
... using PHP 5, you should avoid using foreach by reference values and since all foreaches use internal array pointer ( current($Array) ) nesting foreaches or using PHP array functions can do weird things.
– Chaoix
Jul 12 '19 at 15:13
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MySQL: #126 - Incorrect key file for table
... a ramdisk configured. You can temporarily comment out the ramdisk line to allow such operations if you can't increase the size of it.
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How can I randomize the lines in a file using standard tools on Red Hat Linux?
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I'm usually a Perl fan, but came across this ruby example which has the benefit of being shorter: ruby -e 'puts STDIN.readlines.shuffle'. It would need testing on big inputs to see if the speed is comparable. (also works on OS X)
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join list of lists in python [duplicate]
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@ZachEstela, I'm happy to see someone call this unpythonic. It seems like many techniques others like to call pythonic are not easily understood at first glance. Readability is one of the things that makes Python attractive to me. This solution is cool, and pro...
How to use background thread in swift?
...syntax without some modifications. Passing QOS_CLASS_BACKGROUND didn't actually work, instead use Int(QOS_CLASS_BACKGROUND.value).
For more information see Apples documentation
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