大约有 48,000 项符合查询结果（耗时：0.0841秒） [XML]
Retrieving the last record in each group - MySQL
...rflow August data dump. I'll use that for benchmarking. There are 1,114,357 rows in the Posts table. This is running on MySQL 5.0.75 on my Macbook Pro 2.40GHz.
I'll write a query to find the most recent post for a given user ID (mine).
First using the technique shown by @Eric with the GROUP BY ...
How do I initialize an empty array in C#?
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454
If you are going to use a collection that you don't know the size of in advance, there are bett...
How to check a string for specific characters?
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How to get the first five character of a String
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You can use Enumerable.Take like:
char[] array = yourStringVariable.Take(5).ToArray();
Or you can use String.Substring.
string str = yourStringVariable.Substring(0,5);
Remember that String.Substring could throw an exception in case of string's length less than the characters required.
If ...
iPhone UIView Animation Best Practice
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[UIView transitionWithView:mysuperview
duration:0.75
options:UIViewAnimationTransitionFlipFromRight
animations:^{
[myview removeFromSuperview];
}
completion:nil];
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Is object empty? [duplicate]
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457
I'm assuming that by empty you mean "has no properties of its own".
// Speed up calls to hasOw...
Find the division remainder of a number
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edited Feb 27 '16 at 17:51
Jon Skeet
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Is there any “font smoothing” in Google Chrome?
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