大约有 47,000 项符合查询结果（耗时：0.0758秒） [XML]
Is it possible to GROUP BY multiple columns using MySQL?
...garding SUM using with GROUP BY. If GROUP BY only by one column, then SUMs all values of each distinct (different) the column value sqlfiddle.com/#!9/1cbde2/2. If GROUP BY two columns. Then mysql at first checks if for the first column value there are different values in the second column. If yes, t...
How do you run a Python script as a service in Windows?
...e which provides a higher level interface for operations on these objects, and the other programs to access the objects through that service.
...
How to get the original value of an attribute in Rails
...ibute will give you the previous value.
For rails 5.1+
Copied from Lucas Andrade's answer below: https://stackoverflow.com/a/50973808/9359123
Appending _was is deprecated in rails 5.1, now you should append _before_last_save
Something like:
before_save object
do_something_with object.name_...
HTML5 Canvas Resize (Downscale) Image High Quality?
...otal and the result will be poor as you already noticed.
Try with just one extra step, or at tops two.
Convolutions
In case of Photoshop notice that it applies a convolution after the image has been re-sampled, such as sharpen. It's not just bi-cubic interpolation that takes place so in order to ful...
browser sessionStorage. share between tabs?
...nStorage data from one tab to another.
This code would need to exist on ALL tabs. It should execute before your other scripts.
// transfers sessionStorage from one tab to another
var sessionStorage_transfer = function(event) {
if(!event) { event = window.event; } // ie suq
if(!event.newValu...
CGContextDrawImage draws image upside down when passed UIImage.CGImage
...answered Feb 6 '09 at 20:46
Kendall Helmstetter GelnerKendall Helmstetter Gelner
72.5k2626 gold badges123123 silver badges146146 bronze badges
...
Given a view, how do I get its viewController?
...r, because that would break MVC principles.
The controller, on the other hand, knows which view it's responsible for (self.view = myView), and usually, this view delegates methods/events for handling to the controller.
Typically, instead of a pointer to your view, you should have a pointer to your...
How does SIGINT relate to the other termination signals such as SIGTERM, SIGQUIT and SIGKILL?
On POSIX systems, termination signals usually have the following order (according to many MAN pages and the POSIX Spec):
6 ...
Gmail's new image caching is breaking image links in newsletter
...ing else with png, jpg or gif extensions
only.
Don't use any kind of query string in your image url like ?t=34343
your image must include png, jpg or gif as an extension.
your image url must be mapped onto your image directly.
If you need to use some proxy url for your protected images then your res...
Export database schema into SQL file
... Generate Scripts
When generating the scripts, there is an area that will allow you to script, constraints, keys, etc. From SQL Server 2008 R2 there is an Advanced Option under scripting:
share
|
...