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Unique Key constraints for multiple columns in Entity Framework
...et; }
The second parameter in the attribute is where you can specify the order of the columns in the index.
More information: MSDN
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Is Big O(logn) log base e?
... big-O notation is usually written showing only the asymptotically highest order of n, so constant coefficients will drop away. Since a different logarithm base is equivalent to a constant coefficient, it is superfluous.
That said, I would probably assume log base 2.
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Does Python have a string 'contains' substring method?
...contains__(self, item), __iter__(self), and __getitem__(self, key) in that order to determine whether an item lies in a given contains. Implement at least one of those methods to make in available to your custom type.
– BallpointBen
Aug 17 '18 at 7:02
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VIM + JSLint?
...instructions updated for Nov. 2012. Assumes you have Homebrew installed in order to get Node.js, and that you've already installed Syntastic for Vim (I use https://github.com/carlhuda/janus which provides this automatically):
$ brew install node.js
$ npm install -g jshint
Then add '/usr/local/sha...
namedtuple and default values for optional keyword arguments
...(Node._fields)
>>> Node()
Node(val=None, left=None, right=None)
Order
In all versions of Python, if you set fewer default values than exist in the namedtuple, the defaults are applied to the rightmost parameters. This allows you to keep some arguments as required arguments.
>>>...
Handle file download from ajax post
...easily download a file from an AJAX call by setting the correct headers in PHP's response:
Setting headers server-side
header("HTTP/1.1 200 OK");
header("Pragma: public");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
// The optional second 'replace' parameter indicates whe...
How to check Oracle database for long running queries
... s.sql_hash_value
and s.status = 'ACTIVE'
and s.username <> 'SYSTEM'
order by s.sid,t.piece
/
This shows locks. Sometimes things are going slow, but it's because it is blocked waiting for a lock:
select
object_name,
object_type,
session_id,
type, -- Type or system/user l...
Selecting a row of pandas series/dataframe by integer index
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@kilojoules .iloc looks things up by their order in the index (e.g. .iloc[[2]]) is the second "row" in df. That row happens to be at index location 4. .loc looks them up by their index value. So maybe "iloc" is like "i" as in A[i]? :)
– Jim K...
Natural Sort Order in C#
Anyone have a good resource or provide a sample of a natural order sort in C# for an FileInfo array? I am implementing the IComparer interface in my sorts.
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Should I impose a maximum length on passwords?
... treat only the first 256/1024/2k/4k/(whatever) bytes as "significant", in order to avoid crunching on mammoth passwords.]
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