大约有 47,000 项符合查询结果(耗时:0.0584秒) [XML]

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An “and” operator for an “if” statement in Bash

I'm trying to create a simple Bash script to check if the website is down and for some reason the "and" operator doesn't work: ...
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“CASE” statement within “WHERE” clause in SQL Server 2008

I am working with a query which contains "CASE" statement within "WHERE" clause. But SQL Server 2008 is giving some errors while executing it. Can anyone please help me with the correct query? Here is the query: ...
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How to read a text file reversely with iterator in C#

I need to process a large file, around 400K lines and 200 M. But sometimes I have to process from bottom up. How can I use iterator (yield return) here? Basically I don't like to load everything in memory. I know it is more efficient to use iterator in .NET. ...
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javascript set a variable if undefined

I know that I can test for a javascript variable and then define it if it is undefined, but is there not some way of saying ...
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Difference between exit(0) and exit(1) in Python

What's the difference between exit(0) and exit(1) in Python? 5 Answers 5 ...
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How to loop through all but the last item of a list?

I would like to loop through a list checking each item against the one following it. 6 Answers ...
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Where is the .NET Framework 4.5 directory?

I've installed Windows 8, Visual Studio 2012 but don't have a v4.5 directory in %WINDIR%\Microsoft.NET\Framework . 6 Answe...
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Iterate a list with indexes in Python

I could swear I've seen the function (or method) that takes a list, like this [3, 7, 19] and makes it into iterable list of tuples, like so: [(0,3), (1,7), (2,19)] to use it instead of: ...
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C++ auto keyword. Why is it magic?

From all the material I used to learn C++, auto has always been a weird storage duration specifier that didn't serve any purpose. But just recently, I encountered code that used it as a type name in and of itself. Out of curiosity I tried it, and it assumes the type of whatever I happen to assig...
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Convert date to datetime in Python

Is there a built-in method for converting a date to a datetime in Python, for example getting the datetime for the midnight of the given date? The opposite conversion is easy: datetime has a .date() method. ...