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psql: FATAL: role “postgres” does not exist

...s new posgres user won't have a password? – olaoluwa_98 Nov 30 '19
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What is the purpose of Rank2Types?

I am not really proficient in Haskell, so this might be a very easy question. 6 Answers ...
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JavaScript DOM remove element

...e's a slightly more succinct way of removing an element from the DOM than calling .removeChild(element) on its parent, which is to just call element.remove(). In due course, this will probably become the standard and idiomatic way of removing an element from the DOM. The .remove() method was added ...
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Linux反编译全攻略 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

... 00000110 55 50 58 20 54 65 61 6D 2E 20 41 6C 6C 20 52 69 UPX Team. All Ri 00000120 67 68 74 73 20 52 65 73 65 72 76 65 64 2E 20 24 ghts Reserved. $ 从上面的信息中可以看到程序被UPX压缩了,接下来请确信你系统中已有UPX,如果没有请到上面给...
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How to run travis-ci locally

... order to run the build. With jenkins you can download jenkins and run locally. Does travis offer something like this? 9 ...
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Is there a constraint that restricts my generic method to numeric types?

...uce Eckel: And it's not clear that the added complexity is worth the small yield that you get. If something you want to do is not directly supported in the constraint system, you can do it with a factory pattern. You could have a Matrix<T>, for example, and in that Matrix you would like to...
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Regular expression for floating point numbers

...ssues in some languages (like Java). Thanks to the nameless one for originally recognizing this. One relatively simple pattern for matching a floating point number is [+-]?([0-9]*[.])?[0-9]+ This will match: 123 123.456 .456 See a working example If you also want to match 123. (a period w...
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Difference between “change” and “input” event for an `input` element

...st browsers when content is changed and the element loses focus. It's basically an aggregate of changes. It will not fire for every single change as in the case input event. The input event fires synchronously on change of the content for the element. As such, the event listener tends to fire more f...
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Provide an image for WhatsApp link sharing

.... But as soon as you use that link once, this "please note" section starts all over again. Step 1: title Maximum of 65 characters <title>your keyword rich title of the website and/or webpage</title> Step 2: description Maximum of 155 characters <meta name="description" content="des...
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The Definitive C++ Book Guide and List

...tour” is a quick (about 180 pages and 14 chapters) tutorial overview of all of standard C++ (language and standard library, and using C++11) at a moderately high level for people who already know C++ or at least are experienced programmers. This book is an extended version of the material that con...