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Ruby on Rails: how do I sort with two columns using ActiveRecord?
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Assuming you're using MySQL,
Model.all(:order => 'DATE(updated_at), price')
Note the distinction from the other answers. The updated_at column will be a full timestamp, so if you want to sort based on the day it was updated, you need to use a function to get j...
Is the order guaranteed for the return of keys and values from a LinkedHashMap object?
I know LinkedHashMap has a predictable iteration order (insertion order). Does the Set returned by LinkedHashMap.keySet() and the Collection returned by LinkedHashMap.values() also maintain this order?
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Correct way to define Python source code encoding
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How to perform a mysqldump without a password prompt?
...to @Frankline's answer:
The -p option must be excluded from the command in order to use the password in the config file.
Correct:
mysqldump –u my_username my_db > my_db.sql
Wrong:
mysqldump –u my_username -p my_db > my_db.sql
.my.cnf can omit the username.
[mysqldump]
password=my_passw...
Mysql order by specific ID values
Is it possible to sort in mysql by "order by" using predefined set of column values (ID) like: order by (ID=1,5,4,3) so I would get record 1, 5, 4, 3 in that order out?
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Finding most changed files in Git
...fort has no information about it :/). I assume the first set of result are ordered by filename, and the second one by number of commit per file. The man page also mention github.com/tj/git-extras/issues to report issues
– Asenar
Dec 20 '16 at 8:37
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What platforms have something other than 8-bit char?
...n output buffer is not portable: generally you don't know neither the byte order for the platform, nor structure members alignment, so the structure just holds the data, but not describes the way the data should be serialized.
Ok. You may perform byte order transformations and move the structure me...
How do I iterate over an NSArray?
...re is one very interesting feature: concurrent enumeration. If enumeration order is not important and the jobs can be done in parallel without locking, this can provide a considerable speedup on a multi-core system. More about that in the concurrent enumeration section.
[myArray enumerateObjectsUsi...
google chrome extension :: console.log() from background page?
...an still use console.log(), but it gets logged into a separate console.
In order to view it - right click on the extension icon and select "Inspect popup".
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How does MySQL process ORDER BY and LIMIT in a query?
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It will order first, then get the first 20. A database will also process anything in the WHERE clause before ORDER BY.
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