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PostgreSQL return result set as JSON array?
...SON array when the inner select (from t) returns zero rows. This is caused by aggregate functions always returning NULL when the selecting over no rows and solvable by coalesce: array_to_json(coalesce(array_agg(t), array[]::record[])).
– Hannes Landeholm
Mar 3 ...
How to use glOrtho() in OpenGL?
...use OpenGL coordinates start from the bottom left corner of the window. So by flipping, I get a more conventional (0,0) starting at the top left corner of the window rather.
Note that the Z values are clipped from 0 to 1. So be careful when you specify a Z value for your vertex's position, it will ...
What's the difference setting Embed Interop Types true and false in Visual Studio?
...the returned Object to dynamic automatically if the assembly is referenced by the /link compiler option or, equivalently, if the Excel Embed Interop Types property is set to true. True is the default value for this property.”
– Dirk Vollmar
Mar 1 '18 at 10:45...
Apache VirtualHost 403 Forbidden
...n this error. You would also see a log message of the form "client denied by server configuration". The feature is requiring a user identity to access a directory. It is turned on by DEFAULT in the httpd.conf that ships with Apache. You can see the enabling of the feature with the directive
Req...
setTimeout in for-loop does not print consecutive values [duplicate]
...riable "i". When the loop is finished, what's the value of "i"? It's 3! By using an intermediating function, a copy of the value of the variable is made. Since the timeout handler is created in the context of that copy, it has its own private "i" to use.
edit — there have been a couple of com...
Should I use the datetime or timestamp data type in MySQL?
...'s default value, but DATE for example can't, because it uses '0000-00-00' by default, so to solve that matter U should write Your own trigger to that table, to insert current date (without time) in the field/col with DATE mysql type.
– Arthur Kushman
Oct 15 '1...
How to implement a Map with multiple keys? [duplicate]
...ay to go. To extend to an arbitrary number of keys, have a method like getByKey(MetaKey mk, Object k) and then a Map<MetaKey, Map<Object, V>> internally.
– Jeremy Huiskamp
May 4 '09 at 22:21
...
horizontal line and right way to code it in html, css
...
If you really want a thematic break, by all means use the <hr> tag.
If you just want a design line, you could use something like the css class
.hline-bottom {
padding-bottom: 10px;
border-bottom: 2px solid #000; /* whichever color you prefer */...
Chrome Developer Tools: How to find out what is overriding a CSS rule?
... ones with the same name which aren't striked out, remember the listing is by importance.
Or you can view the computed styles. They will be the actually applied styles.
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Abstract classes in Swift Language
... to all types that conform to it
extension Drivable {
func accelerate(by: Float) {
speed += by
}
}
You can now create new types by implementing Drivable.
struct Car: Drivable {
var speed: Float = 0.0
init() {}
}
let c = Car()
c.accelerate(10)
So basically you get:
Co...