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Get top 1 row of each group

... I could upvote more than once. I have returned to this answer about 7.000 times already. There might come a day, when I take the time to understand this, so I wouldn't have to come back. But it is not this day. – mpn275 Sep 9 at 9:56 ...
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When maven says “resolution will not be reattempted until the update interval of MyRepo has elapsed”

...corresponding failed to download artifact directory in my local repo. Next time I run the maven command the artifact download is triggered again. Therefore I'd say it's a client side setting. Nexus side (server repo side), this issue is solved configuring a scheduled task. Client side, this is don...
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Difference between a theta join, equijoin and natural join

... @Pacerier: erm, because I don't know what it is! Last time I looked, the SQL Standard avoided defining what it is. I do know what it is not (not a relation, not a set, not a table, not a table expression). So for ease of reference I employed my own term, 'resultset'. Note that i...
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C# 能否获取一个对象所占内存的大小? - 更多技术 - 清泛网 - 专注C/C++及内核技术

... sizeof 只能在不安全的上下文中使用(请考虑使用 System.Runtime.InteropServices.Marshal.SizeOf) 修改为Marshal.SizeOf方法,改方法返回对象的非托管大小(以字节为单位)。参数可以是引用类型或装箱的值类型。布局必须是连续的或显式的...
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Emacs bulk indent for Python

...can save a couple of keystrokes. Or you can do C-u 10 C-x e to apply it 10 times. (I know it doesn't sound like much, but try re-indenting 100 lines of garbage literal without missing down-arrow, and then having to go up 5 lines and repeat things ;) ). ...
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What are the typical reasons Javascript developed on Firefox fails on IE? [closed]

...or many operations. Be aware that IE8 in standards compliance mode is many times slower and has many more glitches than when in quirks mode when using VML. SVG: IE9 supports SVG natively. IE6-8 can support SVG, but only with external plugins with only some of those plugins supporting JavaScript mani...
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Java compile speed vs Scala compile speed

...ing in Scala for a while and I like it but one thing I'm annoyed by is the time it takes to compile programs. It's seems like a small thing but with Java I could make small changes to my program, click the run button in netbeans, and BOOM, it's running, and over time compiling in scala seems to con...
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Ruby - elegantly convert variable to an array if not an array already

... [*foo] or Array(foo) will work most of the time, but for some cases like a hash, it messes it up. Array([1, 2, 3]) # => [1, 2, 3] Array(1) # => [1] Array(nil) # => [] Array({a: 1, b: 2}) # => [[:a, 1], [:b, 2]] [*[1, 2, 3]] # =&...
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C++ IDE for Linux? [closed]

...o Linux and the first thing I did was try to find a reasonable IDE. At the time this was impossible: no good IDE existed. Epiphany: UNIX is an IDE. All of it.1 And then I realised that the IDE in Linux is the command line with its tools: First you set up your shell Bash, in my case, but many p...
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How do you get a timestamp in JavaScript?

How can I get a timestamp in JavaScript? 39 Answers 39 ...