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boost::flat_map and its performance compared to map and unordered_map
...of a map. It doesn't seem to be nearly as popular as your typical map / unordered_map so I haven't been able to find any performance comparisons. How does it compare and what are the best use cases for it?
...
Styling an input type=“file” button
...ut element. (The label's for attribute must match the file element's id in order for this to work).
<label for="file-upload" class="custom-file-upload">
Custom Upload
</label>
<input id="file-upload" type="file"/>
As an alternative, you could also just wrap the file input elem...
How do I add a class to a given element?
...h is that some other developer might not know it's vital, and remove it in order to clean things up.
– akauppi
Aug 3 '16 at 8:23
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show 5 mo...
How to sort ArrayList in decreasing order?
How to sort an ArrayList<Long> in Java in decreasing order?
14 Answers
14
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oracle group 取每组第一条 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...CT * FROM(
SELECT z.type , z.code ,ROW_NUMBER()
OVER(PARTITION BY z.type ORDER BY z.code) AS code_id
FROM group_info z
)
WHERE code_id =1;
这里涉及到的over()是oracle的分析函数。
参考sql reference文档：
Analytic functions compute an aggregate value based on a group of ...
MySQL: Sort GROUP_CONCAT values
...ion_group-concat:
SELECT student_name,
GROUP_CONCAT(DISTINCT test_score ORDER BY test_score DESC SEPARATOR ' ')
FROM student
GROUP BY student_name;
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Apache2: 'AH01630: client denied by server configuration'
...other
characteristics of client requests was done using the directives
Order, Allow, Deny, and Satisfy.
In 2.4, such access control is done in the same way as other
authorization checks, using the new module mod_authz_host.
The new directive is Require:
2.2 configuration:
Order allow,...
Why is it string.join(list) instead of list.join(string)?
...ng join on strins side-steps this problem at the cost of the "unintuitive" order. A better choice might have been to keep it a function with the first argument being the iterable and the second (optional one) being the joiner string - but that ship has sailed.
– user4815162342
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Multiple submit buttons on HTML form – designate one button as default [duplicate]
...My suggestion is don't fight this behaviour. You can effectively alter the order using floats. For example:
<p id="buttons">
<input type="submit" name="next" value="Next">
<input type="submit" name="prev" value="Previous">
</p>
with:
#buttons { overflow: hidden; }
#button...
How to sort List of objects by some property
...d idea to implement Comparable<T> if there's a single "natural" sort order... otherwise (if you happen to want to sort in a particular order, but might equally easily want a different one) it's better to implement Comparator<T>. This particular situation could go either way, to be honest...