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What is the error “Every derived table must have its own alias” in MySQL?
...g my words:
This error is caused by the fact that you basically generate a new table with your subquery for the FROM command.
That's what a derived table is, and as such, it needs to have an alias (actually a name reference to it).
So given the following hypothetical query:
SELECT id, key1
FROM (
...
How to convert a normal Git repository to a bare one?
...bare true
Note that this is different from doing a git clone --bare to a new location (see below).
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VB.NET equivalent to C# var keyword [duplicate]
...r me in this example
C#
JToken projects = client.Search(ObjCode.PROJECT, new { groupID = userGroupID });
foreach( var j in projects["data"].Children()) {
Debug.WriteLine("Name: {0}", j.Value<string>("name"));
}
VB
Dim projects As JToken = client.Search(ObjCode.PROJECT, New With { ...
How to check if an object is an array?
...if you're not concerned about performance, you could just do a concat to a new empty Array.
someVar = [].concat( someVar );
There's also the constructor which you can query directly:
if (somevar.constructor.name == "Array") {
// do something
}
Check out a thorough treatment from @T.J. Cr...
How to create our own Listener interface in android?
...
Create a new file:
MyListener.java:
public interface MyListener {
// you can define any parameter as per your requirement
public void callback(View view, String result);
}
In your activity, implement the interface:
MyActi...
^M at the end of every line in vim
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answered Jul 10 '09 at 16:51
Tobias BaazTobias Baaz
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How many database indexes is too many?
...ng fields that have a lot of updates or inserts
After a few indexes, get a new log and repeat.
As with all any optimization, I stop when the requested performance is reached (this obviously implies that point 0. would be getting specific performance requirements).
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Reducing Django Memory Usage. Low hanging fruit?
...ements, that would be even better to your memory. spawning seems to be the new fast scalable way to run python web applications.
EDIT: I don't see how switching to mod_wsgi could be "tricky". It should be a very easy task. Please elaborate on the problem you are having with the switch.
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How to parse Excel (XLS) file in Javascript/HTML5
...JSON = function() {
this.parseExcel = function(file) {
var reader = new FileReader();
reader.onload = function(e) {
var data = e.target.result;
var workbook = XLSX.read(data, {
type: 'binary'
});
workbook.SheetNames.forEach(function(sheetName) {
/...
Random hash in Python
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sebssebs
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