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Oracle 分组后取每组第一条数据 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...Oracle 分组后取每组第一条数据的SQL如下，亲测有效：SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY T field1, T Oracle 分组后取每组第一条数据的SQL如下，亲测有效：
SELECT *
FROM (SELECT ROW_NUMBER() OVER(PARTITION BY T.field1, T.field2 ORDER BY...
What is C# analog of C++ std::pair?
I'm interested: What is C#'s analog of std::pair in C++? I found System.Web.UI.Pair class, but I'd prefer something template-based.
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How does collections.defaultdict work?
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There is a great explanation of defaultdicts here: http://ludovf.net/blog/python-collections-defaultdict/
Basically, the parameters int and list are functions that you pass. Remember that Python accepts function names as arguments. int returns 0 by default and list returns a...
Find unused npm packages in package.json
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We can use the below npm module for this purpose:
https://www.npmjs.com/package/npm-check-unused
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What does [nyae] mean in Zsh?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
BeautifulSoup Grab Visible Webpage Text
..." ".join(t.strip() for t in visible_texts)
html = urllib.request.urlopen('http://www.nytimes.com/2009/12/21/us/21storm.html').read()
print(text_from_html(html))
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How to cast Object to its actual type?
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What is Bit Masking?
I am fairly new to C programming, and I encountered bit masking. Can someone explain to me the general concept and function of bit masking? Examples are much appreciated.
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PHP expects T_PAAMAYIM_NEKUDOTAYIM?
Does anyone have a T_PAAMAYIM_NEKUDOTAYIM ?
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如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注IT技能提升
...验证中表现最好的。jmp0xf 译自Edwin Chen
How do you know what machine learning algorithm to choose for your classification problem? Of course, if you really care about accuracy, your best bet is to test out a couple different ones (making sure to try different parameters within each alg...