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Simple basic explanation of a Distributed Hash Table (DHT)
....
There are many other overlay structures such as this that use content-based routing to find the right node on which to store a key. Locating a key in a ring requires searching round the ring one node at a time (unless you keep a local look-up table, problematic in a DHT of thousands of nodes), ...
How to hash a string into 8 digits?
...thon3 -c 'print(hash("foo"))'
-8152690834165248934
This means the hash()-based solution suggested, which can be shortened to just:
hash(s) % 10**8
will only return the same value within a given script run:
#Python 2:
$ python2 -c 's="your string"; print(hash(s) % 10**8)'
52304543
$ python2 -c '...
Why does git revert complain about a missing -m option?
...o do
git cherry-pick -m 2 mycommitsha
This is because -m 1 would merge based on the common parent where as -m 2 merges based on branch y, that is the one I want to cherry-pick to.
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improv...
What's an elegant way to conditionally add a class to an HTML element in a view?
I occasionally have to add a class to an html element based on a condition. The problem is I can't figure out a clean way of doing it. Here's an example of the stuff I've tried:
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Rails 4 Authenticity Token
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For my Rails 4.0.8 based App it was enough to write =token_tag nil or (in .erb) <%= token_tag nil %>
– jmarceli
Nov 10 '14 at 20:40
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Frontend tool to manage H2 database [closed]
How to use H2 database 's integrated managment frontend?
10 Answers
10
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Vim users, where do you rest your right hand? [closed]
...en make 3rd & 4th fingers left & right
Then, to avoid overwriting base Vim features: Toss whatever used to be on ; to the now-empty h button
As a cute bonus, the "l" key now stands for "left" ;)
noremap l h
noremap ; l
noremap h ;
The previous "runners-up", who both u...
Difference between natural join and inner join
...t specify the joining columns in a natural join; the join is strictly name-based. See also Wikipedia.)
(There's a cheat in the inner join output; the a. and b. parts would not be in the column names; you'd just have column1, column2, column1, column3 as the headings.)
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How to select the rows with maximum values in each group with dplyr? [duplicate]
...py the count table into a new object. Then filter for the max of the group based on the first grouping characteristic. For example:
count_table <- df %>%
group_by(A, B) %>%
count() %>%
arrange(A, desc(n))
count_table %>%
group_by...
What is the purpose of Order By 1 in SQL select statement?
...RDER BY 1
...is known as an "Ordinal" - the number stands for the column based on the number of columns defined in the SELECT clause. In the query you provided, it means:
ORDER BY A.PAYMENT_DATE
It's not a recommended practice, because:
It's not obvious/explicit
If the column order changes, ...