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How to express a NOT IN query with ActiveRecord/Rails?
...this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
15 Answers
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JSON.Net Self referencing loop detected
...alse, "MethodHandle":{"Value":{"value":140716810003120}},"Attributes":150,"CallingConvention":1, "ReturnType":"System.Void, System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e", "ReturnTypeCustomAttributes":{"ParameterType":"System.Void, System.Private.CoreLib, ...
How to find gaps in sequential numbering in mysql?
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Update
ConfexianMJS provided much better answer in terms of performance.
The (not as fast as possible) answer
Here's version that works on table of any size (not just on 100 rows):
SELECT (t1.id + 1) as gap_starts_at,
(SELECT MIN(t3.id) -...
Check if object value exists within a Javascript array of objects and if not add a new object to arr
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I've assumed that ids are meant to be unique here. some is a great function for checking the existence of things in arrays:
const arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }];
function ad...
What is the difference between id and class in CSS, and when should I use them? [duplicate]
Here I gave an id to the div element and it's applying the relevant CSS for it.
15 Answers
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“[notice] child pid XXXX exit signal Segmentation fault (11)” in apache error.log [closed]
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found the solution: call set follow-fork-mode child and then attach to the parent process (the one that spawns child processes) -> stackoverflow.com/questions/15126925/…
– maxgalbu
Feb 27 '14 at 14:48
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How is “=default” different from “{}” for default constructor and destructor?
...lt construct one, the compiler will generate a default constructor automatically. Same goes for copy/movement and destructing. Because the user did not provide any of these member functions, the C++11 specification considers this a "trivial" class. It therefore legal to do this, like memcpy their co...
MySQL select 10 random rows from 600K rows fast
...m AS r1 JOIN
(SELECT CEIL(RAND() *
(SELECT MAX(id)
FROM random)) AS id)
AS r2
WHERE r1.id >= r2.id
ORDER BY r1.id ASC
LIMIT 1
This supposes that the distribution of ids is equal, and that there can be gaps in the id list. See the ar...
Can I make a pull request on a gist on GitHub?
... question until it happens.
I recommend instead creating one regular repo called gists and ordering your gists into regular folders.
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How to find largest objects in a SQL Server database?
...ceMB
FROM
sys.tables t
INNER JOIN
sys.indexes i ON t.object_id = i.object_id
INNER JOIN
sys.partitions p ON i.object_id = p.object_id AND i.index_id = p.index_id
INNER JOIN
sys.allocation_units a ON p.partition_id = a.container_id
WHERE
t.name NOT LIKE 'dt%' AND
i.o...