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In Postgresql, force unique on combination of two columns

...ude null values.)" postgresql.org/docs/8.1/static/ddl-constraints.html#AEN2038 – ndequeker Feb 3 '17 at 13:53 How can ...
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'const string' vs. 'static readonly string' in C#

... answered Jul 6 '10 at 23:29 SLaksSLaks 771k161161 gold badges17711771 silver badges18631863 bronze badges ...
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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术

...代码列在下面: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 #include <stdio.h> struct str{ int len; char s[0]; }; struct foo { struct str *a; }; int main(int argc, char** argv) { struct foo f={0}...
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Getting exact error type in from DbValidationException

...iest way I've found to get instant insight into these errors. For Visual 2012+ users who care only about the first error and might not have a catch block, you can even do: ((System.Data.Entity.Validation.DbEntityValidationException)$exception).EntityValidationErrors.First().ValidationErrors.First(...
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How to get the anchor from the URL using jQuery?

... 208 You can use the .indexOf() and .substring(), like this: var url = "www.aaa.com/task1/1.3.html#...
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git - merge conflict when local is deleted but file exists in remote

... answered Dec 1 '10 at 0:07 CascabelCascabel 398k6464 gold badges352352 silver badges307307 bronze badges ...
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Which concurrent Queue implementation should I use in Java?

... ArrayBlockingQueue is a queue of a fixed size. So if you set the size at 10, and attempt to insert an 11th element, the insert statement will block until another thread removes an element. The fairness issue is what happens if multiple threads try to insert and remove at the same time (in other wor...
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Can I comment out a line in a .git/config file?

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What does void* mean and how to use it?

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Make a div fill the height of the remaining screen space

... 2015 update: the flexbox approach There are two other answers briefly mentioning flexbox; however, that was more than two years ago, and they don't provide any examples. The specification for flexbox has definitely settled no...