大约有 40,000 项符合查询结果（耗时：0.0587秒） [XML]
Concatenate multiple result rows of one column into one, group by another column [duplicate]
...cter types (varchar, character, "char"), and some other types.
As isapir commented, you can add an ORDER BY clause in the aggregate call to get a sorted list - should you need that. Like:
SELECT movie, string_agg(actor, ', ' ORDER BY actor) AS actor_list
FROM tbl
GROUP BY 1;
But it's typicall...
Sass Nesting for :hover does not work [duplicate]
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What is define([ , function ]) in JavaScript? [duplicate]
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define() is part of the AMD spec of js
See:
https://github.com/amdjs/amdjs-api/wiki/AMD
Edit: Also see Claudio's answer below. Likely the more relevant explanation.
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Set port for php artisan.php serve
...unless you modify the source code itself. I guess you could write a custom command to wrap the serve command with your preferred arguments: laravel.com/docs/5.4/artisan
– Andreas Bergström
Feb 9 '17 at 0:23
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Get data from JSON file with PHP [duplicate]
... file using file_get_contents():
$str = file_get_contents('http://example.com/example.json/');
Now decode the JSON using json_decode():
$json = json_decode($str, true); // decode the JSON into an associative array
You have an associative array containing all the information. To figure out how ...
Duplicate files copied (Android Studio 0.4.0) [duplicate]
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According to comment 14 in this bug: https://code.google.com/p/android/issues/detail?id=61573#c14 this is a bug in v0.7.0 of the Android Gradle plugin, and is due to be fixed soon in 0.7.1.
EDIT
Here are the notes from that bug about th...
Apply style to parent if it has child with css [duplicate]
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According to this similar question: stackoverflow.com/questions/1014861/… the :has() pseudoclass no longer works with any browser as of 2016. Just so people don't get frustrated at this not working.
– Ryan Smith
Jun 28 '16 at 19:21
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numpy matrix vector multiplication [duplicate]
... axes=1)
array([16, 6, 8])
Don't use numpy.vdot if you have a matrix of complex numbers, as the matrix will be flattened to a 1D array, then it will try to find the complex conjugate dot product between your flattened matrix and vector (which will fail due to a size mismatch n*m vs n).
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Multiple classes inside :not() [duplicate]
... @Sean - Are you using jQuery instead of plain CSS? stackoverflow.com/questions/10711730/…
– Sphinxxx
Aug 23 '17 at 11:59
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TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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Tokutek数据
带索引插入性能对比。
http://www.tokutek.com/2013/06/iibench-benchmark-tokumx-vs-mongodb/
以上为Tokutek的测试数据，下面为我测试的数据：
笔者实际测试
生产数据2亿多条导入测试
先建集合，创建3个索引，包括_id共4个...