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What's wrong with nullable columns in composite primary keys?
...ow in a table: when a table has a primary key, you have a guranteed way to select any row from it.
A unique constraint does not necessarily identify every row; it just specifies that if a row has values in its columns, then they must be unique. This is not sufficient to uniquely identify every row...
How to add 30 minutes to a JavaScript Date object?
...in case this is not obvious, the reason we multiply minutes by 60000 is to convert minutes to milliseconds.
Be Careful with Vanilla Javascript. Dates Are Hard!
You may think you can add 24 hours to a date to get tomorrow's date, right? Wrong!
addMinutes(myDate, 60*24); //DO NOT DO THIS
It turns...
Transpose list of lists
... each column. The columns are just passed through to the outer map() which converts them from tuples to lists.
Somewhere in Python 3, map() stopped putting up with all this abuse: the first parameter cannot be None, and ragged iterators are just truncated to the shortest. The other methods still wo...
Insert HTML into view from AngularJS controller
...r $sce to resolve that.
$sce
Use $sce.trustAsHtml() in the controller to convert the html string.
$scope.thisCanBeusedInsideNgBindHtml = $sce.trustAsHtml(someHtmlVar);
ngSanitize
There are 2 steps:
include the angular-sanitize.min.js resource, i.e.:
<script src="lib/angular/angular-sanit...
“for loop” with two variables? [duplicate]
...other set (Note that if your lists contains other lists, you might want to convert the inner lists to tuples first so that they are hashable; otherwise the call to set will fail.). The list function then turns the set back into a list.
UPDATE 2
OR, the OP might want elements that are identical in...
How do I implement an Objective-C singleton that is compatible with ARC?
How do I convert (or create) a singleton class that compiles and behaves correctly when using automatic reference counting (ARC) in Xcode 4.2?
...
Remove Safari/Chrome textinput/textarea glow
... you can interact with. Let accessibility trump aesthetics here.
textarea, select, input, button { outline: none; }
Although, it's been argued that keeping the glow/outline is actually beneficial for accessibility as it can help users see which Element is currently focused.
You can also use the pse...
“Default Activity Not Found” on Android Studio upgrade
...e launch activity default?
possibly this could be your mistake
Step 1: Select Edit Configurations
Step 2: watch this warning: Default Activity not found
Step 3: select a default activity
Step 3: Save your changes and finish
Good Luck
...
Increasing (or decreasing) the memory available to R processes
...program
icon (the icon on your desktop or in
your programs directory). Select
``Properties'', and then select the
``Shortcut'' tab. Look for the
``Target'' field and after the closing
quotes around the location of the R
executible, add
--max-mem-size=500M
as shown in the fig...
Getting all types in a namespace via reflection
...etTypes()
where t.IsClass && t.Namespace == nspace
select t;
q.ToList().ForEach(t => Console.WriteLine(t.Name));
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