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Why use multiple columns as primary keys (composite primary key)
...e from developers that are not sql developers or sql DBA's and don't spend all their time in sql. Even in pure sql I'd rather have a meaningless auto-generated key as the primary key when joining than have to remember to pass n bits of data around being the natural key. You're welcome to your viewpo...
How can I find script's directory with Python? [duplicate]
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You need to call os.path.realpath on __file__, so that when __file__ is a filename without the path you still get the dir path:
import os
print(os.path.dirname(os.path.realpath(__file__)))
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How to set a selected option of a dropdown list control using angular JS
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Usually you would set these things in the controller, on the $scope variable. So assuming you're in a single scope, in your controller you could say $scope.item.selectedVariant = 0, to set the default selected value. You could a...
What is the benefit of zerofill in MySQL?
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@diEcho: If for example you want all your invoice numbers to be displayed with 10 digits then you can declare the type of that column as INT(10) ZEROFILL.
– Mark Byers
Mar 10 '11 at 7:21
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How to extract the file name from URI returned from Intent.ACTION_GET_CONTENT?
...ing(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
} finally {
cursor.close();
}
}
if (result == null) {
result = uri.getPath();
int cut = result.lastIndexOf('/');
if (cut != -1) {
result = result.substring(cut + 1);
}
}
return result;
}
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How to get a number of random elements from an array?
... @Derek朕會功夫 Ah, clever, that works much better for small samples from large ranges indeed. Especially with using an ES6 Set (which wasn't available in '13 :-/)
– Bergi
Aug 8 '17 at 0:22
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How do I set the size of Emacs' window?
... (progn
;; use 120 char wide window for largeish displays
;; and smaller 80 column windows for smaller displays
;; pick whatever numbers make sense for you
(if (> (x-display-pixel-width) 1280)
(add-to-list 'default-frame-alist (cons 'width 120))
(add-to-list ...
How do you simulate Mouse Click in C#?
...eness of the question, I thought people might benefit from an example that allows them to do more than just a left click suck a right or middle click or allow click and drag.
– Keith
Aug 19 '11 at 15:01
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Error installing mysql2: Failed to build gem native extension
I am having some problems when trying to install mysql2 gem for Rails. When I try to install it by running bundle install or gem install mysql2 it gives me the following error:
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Understanding promises in Node.js
From what I have understood there are three ways of calling asynchronous code:
9 Answers
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