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MySQL “Group By” and “Order By”
...olumns in a SELECT with a GROUP BY clause is non-standard. MySQL will generally return the values of the first row it finds and discard the rest. Any ORDER BY clauses will only apply to the returned column value, not to the discarded ones.
IMPORTANT UPDATE
Selecting non-aggregate columns used to wor...
Using parameters in batch files at Windows command line
...s the executable (batch file) name as specified in the command line.
%* is all parameters specified in the command line -- this is very useful if you want to forward the parameters to another program.
There are also lots of important techniques to be aware of in addition to simply how to access th...
Differences between cookies and sessions?
...
"passing it in a URL (which poses a security risk)." actually both approach have security risks (different ones). Secret-ID in the URL can be made secure if done properly, and if the user understands that the URL is secret and cannot be posted in a public forum ever.
...
What is the opposite of evt.preventDefault();
... e.preventDefault();
var $this = $(this);
$.ajax('/path/to/script.php',
{
type: "POST",
data: { value: $("#input_control").val() }
}).done(function(response) {
$this.unbind('submit').submit();
});
});
...
Comparison of Lucene Analyzers
...text. For example, KeywordAnalyzer you mentioned doesn't split the text at all and takes all the field as a single token. At the same time, StandardAnalyzer (and most other analyzers) use spaces and punctuation as a split points. For example, for phrase "I am very happy" it will produce list ["i", "...
Popstate on page's load in Chrome
I am using History API for my web app and have one issue.
I do Ajax calls to update some results on the page and use history.pushState() in order to update the browser's location bar without page reload. Then, of course, I use window.popstate in order to restore previous state when back-button i...
How do I connect to a MySQL Database in Python?
...onnecting to MYSQL with Python 2 in three steps
1 - Setting
You must install a MySQL driver before doing anything. Unlike PHP, Only the SQLite driver is installed by default with Python. The most used package to do so is MySQLdb but it's hard to install it using easy_install. Please note MySQLdb o...
Send POST request using NSURLSession
...;
[request setHTTPMethod:@"POST"];
NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: @"TEST IOS", @"name",
@"IOS TYPE", @"typemap",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
[re...
Which Java Collection should I use?
...ist is preferable. LinkedList has per-element overhead, so it is asymptotically worse in terms of memory consumption than an ArrayList. Also, if most of the access is at the end of the list, an ArrayList is preferable because it provides constant-time random element access. Accessing the nth element...
Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
...
It's not faster.
If you really care, compile with assembler output for your platform and look to see.
It doesn't matter. This never matters. Write your infinite loops however you like.
...