大约有 3,800 项符合查询结果（耗时：0.0165秒） [XML]
How do I (or can I) SELECT DISTINCT on multiple columns?
...would qualify as "distinct" (though looking identical to the human eye):
(123, NULL)
(123, NULL)
Also passes in a unique index and almost anywhere else, since NULL values do not compare equal according to the SQL standard. See:
Create unique constraint with null columns
OTOH, GROUP BY, DISTIN...
Why doesn't C# support the return of references?
...rn ref x;
else
return ref y;
}
and then call it with
int a = 123;
int b = 456;
ref int c = ref Max(ref a, ref b);
c += 100;
Console.WriteLine(b); // 556!
I know empirically that it is possible to build a version of C# that supports these features because I have done so. Advanced pr...
How to get URI from an asset File?
...etting the file path from that cache file.
@Throws(IOException::class)
fun getFileFromAssets(context: Context, fileName: String): File = File(context.cacheDir, fileName)
.also {
if (!it.exists()) {
it.outputStream().use { cache ->
...
How do I escape ampersands in XML so they are rendered as entities in HTML?
...DATA tags:
<![CDATA[
This is some text with ampersands & other funny characters. >>
]]>
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Is there an easy way to strike through text in an app widget?
...
Here is an extension for all you Kotlin folks
fun TextView.showStrikeThrough(show: Boolean) {
paintFlags =
if (show) paintFlags or Paint.STRIKE_THRU_TEXT_FLAG
else paintFlags and Paint.STRIKE_THRU_TEXT_FLAG.inv()
}
Usage
textView.showStri...
How to install Java SDK on CentOS?
...w to install JDK via yum and then setting the path can be found here (have fun!) - Install OpenJDK and set $JAVA_HOME path
OpenJDK 6:
yum install java-1.6.0-openjdk-devel
OpenJDK 7:
yum install java-1.7.0-openjdk-devel
To list all available java openjdk-devel packages try:
yum list "java-*-o...
AngularJS : Initialize service with asynchronous data
...vice wait for MyService to get initialized?
– testing123
Apr 30 '13 at 13:07
2
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What's a good hex editor/viewer for the Mac? [closed]
...
Yea, and you can read the developer talking about fun implementing stuff on it here ridiculousfish.com/blog
– kch
May 6 '09 at 0:50
4
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How to add MVC5 to Visual Studio 2013?
...a if exist. After the setup windows may restart, and you are ready to have fun with your Web Developer Tools now.
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How can I fill out a Python string with spaces?
...templates with only a single {...} and nothing else. Just use the format() function and save yourself the parsing overhead: format('Hi', '<16').
– Martijn Pieters♦
Jan 7 '18 at 16:29
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