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How to create composite primary key in SQL Server 2008
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create table my_table (
column_a integer not null,
column_b integer not null,
column_c varchar(50),
primary key (column_a, column_b)
);
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vagrant up failed, /dev/vboxnetctl: no such file or directory
Can be useful, I found this error. The common solution is reinstall virtualbox but there are a better way.
8 Answers
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What are .a and .so files?
...ories... /usr/lib and /lib have most of them, and there is also the LIBRARY_PATH environment variable.
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Should I store entire objects, or pointers to objects in containers?
... storing pointers into vector can be efficient if used along with a custom allocator for the pointees. The custom allocator has to take care of the cache locality, for example using placement new (see en.wikipedia.org/wiki/Placement_syntax#Custom_allocators).
– amit
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How does MongoDB sort records when no sort order is specified?
...teed to be that they are in the inserted order. They are not sorted by the _id field. Sometimes it can be look like it is sorted by the insertion order but it can change in another request. It is not reliable.
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Readonly Properties in Objective-C?
...ing"; // Notice the underscore prefix of var name.
That’s it, that’s all you need. No muss, no fuss.
Details
As of Xcode 4.4 and LLVM Compiler 4.0 (New Features in Xcode 4.4), you need not mess with the chores discussed in the other answers:
The synthesize keyword
Declaring a variable
Re-...
Limit results in jQuery UI Autocomplete
...);
}
});
You can supply a function to the source parameter and then call slice on the filtered array.
Here's a working example: http://jsfiddle.net/andrewwhitaker/vqwBP/
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How to change the text of a label?
...d child pages. How I write in child pages. I write $('#contentPlaceHolderId_LabelID') it not works. I also change th ClientMode to Static but no work. Please help.
– Salman Mushtaq
Feb 17 '16 at 12:52
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Using Jasmine to spy on a function without an object
...ause I'm trying to mock up an existing window function; $window.open(url, '_blank'); with the intention of opening a new tab (or window depending on browser setup). How should I be going about making sure it's calling this function and verifying that it's navigating to the right url regardless of th...
Sending a JSON to server and retrieving a JSON in return, without JQuery
.../json");
// build a PHP variable from JSON sent using POST method
$v = json_decode(stripslashes(file_get_contents("php://input")));
// build a PHP variable from JSON sent using GET method
$v = json_decode(stripslashes($_GET["data"]));
// encode the PHP variable to JSON and send it back on client-sid...