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mongo group query how to keep fields
...t suggestions]
I came here looking for an answer but wasn't happy with the selected answer (especially given it's age). I found this answer that is a better solution (adapted):
db.test.aggregate({
$group: {
_id: '$name',
person: { "$first": "$$ROOT" },
count: { $sum: 1 }
},
{
"$r...
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...Shouldn't the threads in the connection pool be kept active by firing the "select 1" validation query? Why would they get closed by prolonged inactivity when we have set the evictor to run at shorter time intervals than the mysql server timeout?
– Farhad
Sep 2 ...
“cannot resolve symbol R” in Android Studio
... compileSdkVersion 21
buildToolsVersion '21.0.1'
......
....
}
Or
Select File | Project Structure change Build Tools Version to 21.1.1
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How do I cancel a build that is in progress in Visual Studio?
...n do following
Click Build --> Cancel from the Visual Studio Menu
or
Select Azure App Service Activity window --> Cancel
it will cancel the publish activity.
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How to version control a record in a database
...tDate of the second record.
When you want to view the current record, you select the one where endDate is null.
This is sometimes called a type 2 Slowly Changing Dimension.
See also TupleVersioning
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Flash CS4 refuses to let go
...ation Support/
You can remove those files by hand, or in Flash you can select Control->Delete ASO files to remove them.
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Check/Uncheck checkbox with JavaScript (jQuery or vanilla)?
...
You really don't need the array index if you are only selecting one element. But I guess if you want to be explicit. haha
– Rizowski
Apr 22 '15 at 18:46
6
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How to clear an ImageView in Android?
... No, I don't want this. I want just to clear the contents. The user may select new image after.
– Pentium10
May 18 '10 at 17:08
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ADB Install Fails With INSTALL_FAILED_TEST_ONLY
...uses). If
you want a debuggable APK that people can install without adb, select
your debug variant and click Build > Build APK(s).
Same goes for release build, with Android Studio 3 you need to go to Build > Build APK(s) to have a non testable release apk that you can submit to the store...
How to get a Static property with Reflection
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This is the best option, in my opinion it should be selected as the answer.
– c0y0teX
Apr 10 '17 at 18:58
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