大约有 47,000 项符合查询结果（耗时：0.0558秒） [XML]
MySQL - force not to use cache for testing speed of query
I'm testing the speed of som>me m> queries in MySQL. The database is caching these queries making it difficult for m>me m> to get reliable results when testing how fast these queries are.
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Look up all descendants of a class in Ruby
...slow if you're trying to shave milliseconds, but it's perfectly speedy for m>me m>.
– Douglas Squirrel
Mar 6 '10 at 20:01
1
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Combine two or more columns in a datafram>me m> into a new column with a new nam>me m>
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.@thelatemail - This worked for m>me m>: paste(df$n,df$s,sep="-")
– Chetan Arvind Patil
Oct 6 '17 at 19:09
2
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How can I delete all of my Git stashes at once?
...lowing command deletes all your stashes:
git stash clear
From the git docum>me m>ntation:
clear
Remove all the stashed states.
IMPORTANT WARNING: Those states will then be subject to pruning, and may be impossible to recover (...).
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Shell script to send email [duplicate]
I am on linux machine and I monitor a process usage. Most of the tim>me m> I will be away from my system and I have access to internet on my device. So I planned to write a shell-script that can mail m>me m> the output of the process.
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Ordering by the order of values in a SQL IN() clause
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Use MySQL's FIELD() function:
SELECT nam>me m>, description, ...
FROM ...
WHERE id IN([ids, any order])
ORDER BY FIELD(id, [ids in order])
FIELD() will return the index of the first param>me m>ter that is equal to the first param>me m>ter (other than the first param>me m>ter itself...
How do I hide the status bar in a Swift iOS app?
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You really should implem>me m>nt prefersStatusBarHidden on your view controller(s):
Swift 3 and later
override var prefersStatusBarHidden: Bool {
return true
}
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Format number to always show 2 decimal places
....round(num * 100) / 100).toFixed(2);
Live Demo
var num1 = "1";
docum>me m>nt.getElem>me m>ntById('num1').innerHTML = (Math.round(num1 * 100) / 100).toFixed(2);
var num2 = "1.341";
docum>me m>nt.getElem>me m>ntById('num2').innerHTML = (Math.round(num2 * 100) / 100).toFixed(2);
var num3 = "1.345";
docum>me m>n...
Why does the 260 character path length limit exist in Windows?
I have com>me m> up against this problem a few tim>me m>s at inopportune mom>me m>nts:
11 Answers
11
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How to run mvim (MacVim) from Terminal?
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There should be a script nam>me m>d mvim in the root of the .bz2 file. Copy this som>me m>where into your $PATH ( /usr/local/bin would be good ) and you should be sorted.
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