大约有 45,000 项符合查询结果（耗时：0.0492秒） [XML]
SQL/mysql - Select distinct/UNIQUE but return all columns?
...y applicable to numeric values, but also compare the alphabetical order of string values.
SELECT country, MAX(city) FROM locations
GROUP BY country
will result in:
--country-- --city--
France Paris
Poland Krakow
Italy Milano
or:
SELECT country, MIN(city) FROM locations
GROU...
Why is x86 ugly? Why is it considered inferior when compared to others? [closed]
...rip through memory more frequently than would otherwise be necessary. The extra instructions needed to do this take execution resources that could be spent on useful work, although efficient store-forwarding keeps the latency low. Modern implementations with register renaming onto a large physical...
Declare a constant array
...fined as locals in functions, and can only be numbers, characters (runes), strings or booleans. Because of the compile-time restriction, the expressions that define them must be constant expressions, evaluatable by the compiler. For instance, 1<<3 is a constant expression, while math.Sin(math....
Does Java casting introduce overhead? Why?
...pe to a wider type, which is done automatically and there is no overhead:
String s = "Cast";
Object o = s; // implicit casting
Explicit casting, when you go from a wider type to a more narrow one. For this case, you must explicitly use casting like that:
Object o = someObject;
String s = (String...
PHP: merge two arrays while keeping keys instead of reindexing?
How can I merge two arrays (one with string => value pairs and another with int => value pairs) while keeping the string/int keys? None of them will ever overlap (because one has only strings and the other has only integers).
...
Complex nesting of partials and templates
...ject to address this problem
For subsections it's as easy as leveraging strings in ng-include:
<ul id="subNav">
<li><a ng-click="subPage='section1/subpage1.htm'">Sub Page 1</a></li>
<li><a ng-click="subPage='section1/subpage2.htm'">Sub Page 2</a&g...
How to load a UIView using a nib file created with Interface Builder
...adFromNib.h"
@implementation NSObject (LoadFromNib)
+ (id)loadFromNib:(NSString *)name classToLoad:(Class)classToLoad {
NSArray *bundle = [[NSBundle mainBundle] loadNibNamed:name owner:self options:nil];
for (id object in bundle) {
if ([object isKindOfClass:classToLoad]) {
...
How do you parse and process HTML/XML in PHP?
...'d suggest using a lib that actually uses DOM/libxml underneath instead of string parsing.
FluentDom - Repo
FluentDOM provides a jQuery-like fluent XML interface for the DOMDocument in PHP. Selectors are written in XPath or CSS (using a CSS to XPath converter). Current versions extend the DOM i...
python max function using 'key' and lambda expression
...ms based on a set of rules based on the type of the objects (for example a string is always greater than an integer).
To modify the object before comparison, or to compare based on a particular attribute/index, you've to use the key argument.
Example 1:
A simple example, suppose you have a list ...
How can you integrate a custom file browser/uploader with CKEditor?
...ard alert dialog, such as "illegal file" or something. Set url to an empty string if the third parameter is an error message.
CKEditor's "upload" tab will submit a file in the field "upload" - in PHP, that goes to $_FILES['upload']. What CKEditor wants your server to output is a complete JavaScript...