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Opposite of String.Split with separators (.net)
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Found the answer. It's called String.Join.
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MySQL join with where clause
...N user_category_subscriptions ON
user_category_subscriptions.category_id = categories.category_id
and user_category_subscriptions.user_id =1
See, with an inner join, putting a clause in the join or the where is equivalent. However, with an outer join, they are vastly different.
As a join...
Is SQL or even TSQL Turing Complete?
...e true programming languages, so that's kinda cheating).
In this set of slides Andrew Gierth proves that with CTE and Windowing SQL is Turing Complete, by constructing a cyclic tag system, which has been proved to be Turing Complete. The CTE feature is the important part however -- it allows you to...
UPDATE multiple tables in MySQL using LEFT JOIN
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UPDATE t1
LEFT JOIN
t2
ON t2.id = t1.id
SET t1.col1 = newvalue
WHERE t2.id IS NULL
Note that for a SELECT it would be more efficient to use NOT IN / NOT EXISTS syntax:
SELECT t1.*
FROM t1
WHERE t1.id NOT IN
(
SELECT id
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Change the name of the :id parameter in Routing resources for Rails
...he post is https://thoughtbot.com/blog/rails-patch-change-the-name-of-the-id-parameter-in
5 Answers
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Unable to copy ~/.ssh/id_rsa.pub
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DISPLAY=:0 xclip -sel clip < ~/.ssh/id_rsa.pub didn't work for me (ubuntu 14.04), but you can use :
cat ~/.ssh/id_rsa.pub
to get your public key
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SQL query for finding records where count > 1
I have a table named PAYMENT . Within this table I have a user ID, an account number, a ZIP code and a date. I would like to find all records for all users that have more than one payment per day with the same account number.
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Knight's Shortest Path on Chessboard
...alculate all the distances
and save it to a 8x8 full matrix.
well, I would call that cheating,
and works only because the problem
is small. But sometimes competitions
will check how fast your program
runs.
The main point is that if you are preparing
for a programming competition, you must know
comm...
Print Current Mercurial Revision Hash?
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Try:
hg id -i
Example:
$ hg id -i
adc56745e928
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asp.net mvc: why is Html.CheckBox generating an additional hidden input
...MuffinMan: This is not silly option. Lets say your view model has property called IsActive, which is initiated to true in constructor. User deselects checkbox, but since value is not sent to server, model binder doesn't pick it up, and property value is not changed. Model binder shouldn't assume, th...