大约有 1,300 项符合查询结果（耗时：0.0240秒） [XML]
Can I use a function for a default value in MySql?
... Nov 6 '08 at 21:24
Thibaut BarrèreThibaut Barrère
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Approximate cost to access various caches and main memory?
...0 ns (16µs) SSD random read (olibre's note: should be less)
500 000 ns (½ms) Round trip in datacenter
2 000 000 ns (2ms) HDD random read (seek)
See also other sources
What every programmer should know about memory from Ulrich Drepper (2007)
Old but still an excellent deep explanation abou...
Drop unused factor levels in a subsetted data frame
... answered Jun 12 '17 at 9:44
AurèleAurèle
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PHP: How to remove all non printable characters in a string?
...the other answers here do not take into account unicode characters (e.g. öäüßйȝîûηыეமிᚉ⠛ ). In this case you can use the following:
$string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]/u', '', $string);
There's a strange class of characters in the range \x80-\x9F (J...
Get folder name from full file path
...red Mar 8 '11 at 6:53
Øyvind BråthenØyvind Bråthen
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Get the (last part of) current directory name in C#
...ot exactly what the question was about.
– Jakob Möllås
May 16 '11 at 13:47
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How can I get the full/absolute URL (with domain) in Django?
...nswered Aug 23 '13 at 7:07
ébewèébewè
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How to check if a query string value is present via JavaScript?
...wered Jun 12 '14 at 8:34
HumppakäräjätHumppakäräjät
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Can I force pip to reinstall the current version?
I've come across situations where a current version of a package seems not to be working and requires reinstallation. But pip install -U won't touch a package that is already up-to-date. I see how to force a reinstallation by first uninstalling (with pip uninstall ) and then installing, but is th...
Formatting “yesterday's” date in python
...wered Dec 4 '18 at 12:08
Arvid BäärnhielmArvid Bäärnhielm
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