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Multiple Indexes vs Multi-Column Indexes
...e multi-column index can be used for queries referencing all the columns:
SELECT *
FROM TableName
WHERE Column1=1 AND Column2=2 AND Column3=3
This can be looked up directly using the multi-column index. On the other hand, at most one of the single-column index can be used (it would have to look u...
Authentication issue when debugging in VS2013 - iis express
...4 to get the project properties when you have the top level of the project selected. Do not right click on the project and select properties, this is something entirely different.
Change Anonymous Authentication to be Disabled and Windows Authentication to be Enabled.
Works like gravy :)
...
How do I launch the Android emulator from the command line?
...pment you just use the same Ant script you used to build the project, just select install target. However, you can install the application manually using command adb install <path-to-your-APK>.
Now switch to emulator and launch your application like on any normal device, through the launcher. ...
How to detect unused methods and #import in Objective-C
...pecific compiler warnings that can warn you of some types of unused code. (Select the project in the source list and File > Get Info, then select the Build tab.) Here are a few (which show up for Clang and GCC 4.2 for me) which may be of interest:
Unused Functions
Unused Parameters
Unused Value...
iOS5 Storyboard error: Storyboards are unavailable on iOS 4.3 and prior
... it runs on iOS 4.3. I clicked on the gray 5.0 in the project settings and selected 4.3.
18 Answers
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docker mounting volumes on host
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The VOLUME command will mount a directory inside your container and store any files created or edited inside that directory on your hosts disk outside the container file structure, bypassing the union file system.
The idea is that your vol...
Filtering for empty or NULL names in a queryset
...null, not-empty alias field. The generated SQL would look something like:
SELECT * FROM Name WHERE alias IS NOT NULL AND alias != ""
You can also pass multiple arguments to a single call to exclude, which would ensure that only objects that meet every condition get excluded:
Name.objects.exclude...
Which annotation should I use: @IdClass or @EmbeddedId
...and @EmbeddedId is when it comes to write HQL :
With @IdClass you write:
select e.name from Employee e
and with @EmbeddedId you have to write:
select e.employeeId.name from Employee e
You have to write more text for the same query. Some may argue that this differs from a more natural language l...
Access “this” from Java anonymous class
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Container.this.select();
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HTTP Error 503, the service is unavailable
...ur web site, and click on it. On the Advanced Settings menu to the right, select Identity and change it and enter new user and password. Click on your Application Pool again, and select Recycle to restart it.
You can also try looking at the error message in Event Viewer, under Windows Logs, Applic...