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Copy values from one column to another in the same table
...ific set of rows:
UPDATE `products` SET `in_stock` = true WHERE `supplier_id` = 10
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Fetch the row which has the Max value for a column
...my_date column value is equal to the maximum value of my_date for that userid. This may retrieve multiple rows for the userid where the maximum date is on multiple rows.
select userid,
my_date,
...
from
(
select userid,
my_date,
...
max(my_date) over (partition by...
ASP.NET_SessionId + OWIN Cookies do not send to browser
...uses System.Web.HttpResponse.Cookies property to store it's ASP.NET_SessionId cookie. Also there is some basic optimization in ASP.NET session state module (System.Web.SessionState.SessionStateModule) implemented through static property named s_sessionEverSet which is quite self explanatory. If you ...
How to change theme for AlertDialog
...
In Dialog.java (Android src) a ContextThemeWrapper is used. So you could copy the idea and do something like:
AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.AlertDialogCustom));
And then style it lik...
how to customize `show processlist` in mysql?
...ng like:
mysql show processlist
| grep -v '^\+\-\-'
| grep -v '^| Id'
| sort -n -k12
The two greps strip out the header and trailer lines (others may be needed if there are other lines not containing useful information) and the sort is done based on the numeric field number 12 (I thin...
How can I easily convert DataReader to List? [duplicate]
...ted code they can be faster then most hand written code as well, so do consider the “high road” if you are doing this a lot.
See "A Defense of Reflection in .NET" for one example of this.
You can then write code like
class CustomerDTO
{
[Field("id")]
public int? CustomerId;
[F...
How to take screenshot of a div with JavaScript?
...ntents.
When the quiz is finished, do this:
var c = document.getElementById('the_canvas_element_id');
var t = c.getContext('2d');
/* then use the canvas 2D drawing functions to add text, etc. for the result */
When the user clicks "Capture", do this:
window.open('', document.getElementById('the...
Regex using javascript to return just numbers
...'.match( numberPattern )
This would return an Array with two elements inside, '102' and '1948948'. Operate as you wish. If it doesn't match any it will return null.
To concatenate them:
'something102asdfkj1948948'.match( numberPattern ).join('')
Assuming you're not dealing with complex decimal...
How do you represent a JSON array of strings?
This is all you need for valid JSON, right?
4 Answers
4
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Pandas percentage of total with groupby
...te the percentage in a simpler way -- just groupby the state_office and divide the sales column by its sum. Copying the beginning of Paul H's answer:
# From Paul H
import numpy as np
import pandas as pd
np.random.seed(0)
df = pd.DataFrame({'state': ['CA', 'WA', 'CO', 'AZ'] * 3,
'...