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postgresql - sql - count of `true` values
...unt(nullif(myCol, false)), -- count true values
count(myCol);
http://www.postgresql.org/docs/9.0/static/functions-conditional.html
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Reading JSON from a file?
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To add on this, today you are able to use pandas to import json:
https://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_json.html
You may want to do a careful use of the orient parameter.
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What is the difference between max-device-width and max-width for mobile web?
... are a lot of "mobile devices" that badly calculate width.
Look at http://www.javascriptkit.com/dhtmltutors/cssmediaqueries2.shtml:
/* #### Mobile Phones Portrait #### */
@media screen and (max-device-width: 480px) and (orientation: portrait){
/* some CSS here */
}
/* #### Mobile Phones Landsca...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
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Django 1.9 added the Field.disabled attribute: https://docs.djangoproject.com/en/stable/ref/forms/fields/#disabled
The disabled boolean argument, when set to True, disables a form field using the disabled HTML attribute so that it won’t be editable by users. Even if...
Origin null is not allowed by Access-Control-Allow-Origin
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@CiaranG I ran python -m SimpleHTTPServer from a command line and then went to localhost:8000, worked for me. Python comes preinstalled with Mac OS X; you may need to install if using another OS.
– Dave Liepmann
Jul 2...
How can I manually generate a .pyc file from a .py file
...ileall.compile_file('YourFileName.py')
Take a look at the links below:
https://docs.python.org/3/library/py_compile.html
https://docs.python.org/3/library/compileall.html
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How can I make setInterval also work when a tab is inactive in Chrome?
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@nthpixel would adding .stop (as per www's answer) help in tat situation (as each time it would be clearing the previous animations)
– user359135
Sep 26 '11 at 10:58
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SQL Server : Columns to Rows
...planation in my post about the full audit trigger, that you can find here: https://stackoverflow.com/a/43800286/4160788
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AngularJS ng-style with a conditional expression
...pe) {
$scope.color = 'blueish';
$scope.zoom = 2;
}
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js"></script>
<div ng-app="app" ng-controller="MyCtrl" ng-style="{
color: {blueish: 'blue', greenish: 'green'}[ color ],
'font-size'...
iOS: Modal ViewController with transparent background
...iew controller is not in a popover.
Available in iOS 8.0 and later.
https://developer.apple.com/documentation/uikit/uiviewcontroller
The 'View Controller Advancements in iOS 8' video from WWDC 2014 goes into this in some detail.
Note:
Be sure to give your presented view controller a clear...