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How can I copy data from one column to another in the same table?
Is it possible to copy data from column A to column B for all records in a table in SQL?
3 Answers
...
py2exe - generate single executable file
...so has this feature, see minty's answer)
I use the version of PyInstaller from svn, since the latest release (1.3) is somewhat outdated. It's been working really well for an app which depends on PyQt, PyQwt, numpy, scipy and a few more.
...
Should I use `this` or `$scope`?
... "controller as" because I like hiding the $scope and exposing the members from the controller to the view via an intermediary object. By setting this.*, I can expose just what I want to expose from the controller to the view. You can do that with $scope too, I just prefer to use standard JavaScript...
Convert any object to a byte[]
...aged memory.
Marshal.StructureToPtr(your_object, ptr, false);
// Copy data from unmanaged memory to managed buffer.
Marshal.Copy(ptr, bytes, 0, size);
// Release unmanaged memory.
Marshal.FreeHGlobal(ptr);
And to convert bytes to object:
var bytes = new byte[size];
var ptr = Marshal.AllocHGlobal(...
How do you unit test a Celery task?
...erialization issues or any other distribution, comunication problem.
So:
from celery import Celery
celery = Celery()
@celery.task
def add(x, y):
return x + y
And your test:
from nose.tools import eq_
def test_add_task():
rst = add.apply(args=(4, 4)).get()
eq_(rst, 8)
Hope that ...
Downloading jQuery UI CSS from Google's CDN
...versions (by about 26% according to Google's PageSpeed plugin for Firefox) from your own domain, which might be faster for your users if your connection is decent and they don't already have the file cached locally.
– Drew Noakes
Jan 30 '11 at 10:15
...
Python glob multiple filetypes
...
from glob import glob
files = glob('*.gif')
files.extend(glob('*.png'))
files.extend(glob('*.jpg'))
print(files)
If you need to specify a path, loop over match patterns and keep the join inside the loop for simplicity:
f...
How many threads is too many?
...ou state, the vast majority of your threads will be waiting for a response from the database so they won't be running. There are two factors that affect how many threads you should allow for.
The first is the number of DB connections available. This may be a hard limit unless you can increase it at...
What does the term “porcelain” mean in Git?
...
"Porcelain" is the material from which toilets are usually made (and sometimes other fixtures such as washbasins). This is distinct from "plumbing" (the actual pipes and drains), where the porcelain provides a more user-friendly interface to the plumbin...
Remove blank attributes from an Object in Javascript
...ete obj[key]);
};
jsbin
4) This function uses recursion to delete items from nested objects as well:
const removeEmpty = obj => {
Object.keys(obj).forEach(key => {
if (obj[key] && typeof obj[key] === "object") removeEmpty(obj[key]); // recurse
else if (obj[key] == null) d...