大约有 44,000 项符合查询结果（耗时：0.0599秒） [XML]
COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]
...
Use either COUNT(field) or COUNT(*), and stick with it consistently, and if your database allows COUNT(tableHere) or COUNT(tableHere.*), use that.
In short, don't use COUNT(1) for anything. It's a one-trick pony, which rarely does what you want, and in those rare cases is equivalent to count(*)...
Declaring variables inside a switch statement [duplicate]
...u can't declare and assign variables inside a switch . But I'm wondering if the following is correct at throwing an error saying
...
'dragleave' of parent element fires when dragging over children elements
...
If you don't need to bind events to the child elements, you can always use the pointer-events property.
.child-elements {
pointer-events: none;
}
...
How can I get the last 7 characters of a PHP string?
... php docs:
string substr ( string $string , int $start [, int $length ] )
If start is negative, the returned string will start at the start'th character from the end of string.
share
|
improve thi...
Application_Start not firing?
...(beta) application that I'm working on, and am having trouble figuring out if I'm doing something wrong, or if my Application_Start method in Global.asax.cs is in fact not firing when I try to debug the application.
...
Java FileReader encoding issue
...
Yes, you need to specify the encoding of the file you want to read.
Yes, this means that you have to know the encoding of the file you want to read.
No, there is no general way to guess the encoding of any given "plain text" file.
The one-argu...
How to make a python, command-line program autocomplete arbitrary things NOT interpreter
...t readline
def completer(text, state):
options = [i for i in commands if i.startswith(text)]
if state < len(options):
return options[state]
else:
return None
readline.parse_and_bind("tab: complete")
readline.set_completer(completer)
The official module docs aren't ...
How can you check for a #hash in a URL using JavaScript?
...
Simple:
if(window.location.hash) {
// Fragment exists
} else {
// Fragment doesn't exist
}
share
|
improve this answer
...
MySQL search and replace some text in a field
...
Like Pring, if you're going to leave a comment like that, you might want to explain why. Was it a mistake in the original advice, or a mistake on your part? And you do know that before you make any sweeping changes to a database you ar...
Elevating process privilege programmatically?
...follows:
startInfo.Verb = "runas";
This will cause Windows to behave as if the process has been started from Explorer with the "Run as Administrator" menu command.
This does mean the UAC prompt will come up and will need to be acknowledged by the user: if this is undesirable (for example because...