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Retrieving the last record in each group - MySQL
...is standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer I wrote for this question in 2009:
...
ctypes - Beginner
...estlib.so -fPIC testlib.c
# or... for Mac OS X
$ gcc -shared -Wl,-install_name,testlib.so -o testlib.so -fPIC testlib.c
Then, write a wrapper using ctypes:
testlibwrapper.py
import ctypes
testlib = ctypes.CDLL('/full/path/to/testlib.so')
testlib.myprint()
Now execute it:
$ python testlibwrapper...
Android: How can I validate EditText input?
...ern.compile("[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz123456789_]*");
Matcher matcher = pattern.matcher(checkMe);
boolean valid = matcher.matches();
if(!valid){
Log.d("", "invalid");
return "";
}
}
...
How do I trigger the success callback on a model.save()?
...y just pass {} in case you want to save model itself.
this.model.save({}, _.bind(function(model, response){
//Do whatever you want e.g.
this.collection.add(model)
}, this))
share
|
improve thi...
How do you load custom UITableViewCells from Xib files?
...ell, bundle: nil), forCellReuseIdentifier: MyIdentifier)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: MyIdentifier, for: indexPath) as! ContactsCell
return cell
}
...
How to use MDC with thread pools?
...swered Sep 12 '16 at 16:59
MyKey_MyKey_
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...
How to handle button clicks using the XML onClick within Fragments
... savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_start, container, false);
Button b = (Button) v.findViewById(R.id.StartButton);
b.setOnClickListener(this);
return v;
}
@Override
public void onClick(View v) {
switch (v.getId())...
How can I send an HTTP POST request to a server from Excel using VBA?
...rplanet.com/flights.txt", Destination:=Range("A2"))
.PostText = "origin_airport=MSN&destination_airport=ORD"
.RefreshStyle = xlOverwriteCells
.SaveData = True
.Refresh
End With
Notes:
Regarding output... I don't know if it's possible to return the results to the same cell tha...
How do I ignore files in Subversion?
...an error message saying svn: E205007: None of the environment variables SVN_EDITOR, VISUAL or EDITOR are set, and no 'editor-cmd' run-time configuration option was found instead of getting an editor opened. So just specify --editor-cmd nano like this svn propedit svn:ignore . --editor-cmd nano
...
move_uploaded_file gives “failed to open stream: Permission denied” error
...
This is because images and tmp_file_upload are only writable by root user. For upload to work we need to make the owner of those folders same as httpd process owner OR make them globally writable (bad practice).
Check apache process owner: $ps aux | gre...