大约有 40,000 项符合查询结果（耗时：0.0506秒） [XML]
Using LIMIT within GROUP BY to get N results per group?
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You could use GROUP_CONCAT aggregated function to get all years into a single column, grouped by id and ordered by rate:
SELECT id, GROUP_CONCAT(year ORDER BY rate DESC) grouped_year
FROM yourtable
GROUP BY id
Result:
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How many files can I put in a directory?
... subdirectories. Also maximum filesize grew to 16 TB. Furthermore, the overall size of the filesystem may be up to 1 EB = 1,048,576 TB.
– devsnd
Jun 25 '12 at 23:13
7
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Packing NuGet projects compiled in release mode?
...ase mode? Or is there some reason I should only publish (make available locally, in this case) packages compiled in debug mode?
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How do I define a method which takes a lambda as a parameter in Java 8?
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Lambdas are purely a call-site construct: the recipient of the lambda does not need to know that a Lambda is involved, instead it accepts an Interface with the appropriate method.
In other words, you define or use a functional interface (i.e. an ...
Gradle alternate to mvn install
...al()
}
dependencies {
compile "foo:sdk:1.0"
}
$sdk> gradle install
$example> gradle build
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Is returning null bad design? [closed]
... I were to define a method in Java that returned a Collection I would typically prefer to return an empty collection (i.e. Collections.emptyList()) rather than null as it means my client code is cleaner; e.g.
Collection<? extends Item> c = getItems(); // Will never return null.
for (Item ite...
Delete specific line number(s) from a text file using sed?
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Not all unixes have gnu sed with "-i". Don't make the mistake of falling back to "sed cmd file > file", which will wipe out your file.
– pra
Jan 22 '10 at 6:53
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rails simple_form - hidden field - create?
... then just use Rails' hidden_field form builder since Simple Form inherits all the form builder methods.
– scarver2
Nov 4 '14 at 1:18
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Check whether a string contains a substring
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This way is especially preferrable, when you are searching using a variable - this way you won't have to double-escape characters (in this variable string), that are special for regular expressions (like :).
– evgeny9
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What is the difference between 'content' and 'text'
...ose that there would be a difference for a non-text response. But where is all this documented? Note that the linked document does state:
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