大约有 5,229 项符合查询结果（耗时：0.0147秒） [XML]
SQL WHERE condition is not equal to?
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BrandonBrandon
64.2k2929 gold badges186186 silver badges218218 bronze badges
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What optimizations can GHC be expected to perform reliably?
...ckage integer-gmp mapped to integer-gmp-0.4.0.0-af3a28fdc4138858e0c7c5ecc2a64f43
wired-in package base mapped to base-4.5.1.0-6e4c9bdc36eeb9121f27ccbbcb62e3f3
wired-in package rts mapped to builtin_rts
wired-in package template-haskell mapped to template-haskell-2.7.0.0-2bd128e15c2d50997ec26a1eaf8b2...
mysql: see all open connections to a given database?
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64
As well you can use:
mysql> show status like '%onn%';
+--------------------------+-------+
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Hiding the scroll bar on an HTML page
...: auto, but I'm not a fan of abusing width for visibility tweaks.
Firefox 64 now supports the experimental scrollbar-width property by default (63 requires a configuration flag to be set). To hide the scrollbar in Firefox 64:
#element {
scrollbar-width: none;
}
To see if your current browser...
Is mongodb running?
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hmm, works for me (Ubuntu 64bit VM, Mongo v1.7.6), so I'm not sure why it's not for you tbh. If you can't get it working, best bet may be to post it on the mongodb forums: groups.google.com/group/mongodb-user
– AdaTheDev
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count the frequency that a value occurs in a dataframe column
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In [38]:
df['a'].value_counts()
Out[38]:
b 3
a 2
s 2
dtype: int64
If you wanted to add frequency back to the original dataframe use transform to return an aligned index:
In [41]:
df['freq'] = df.groupby('a')['a'].transform('count')
df
Out[41]:
a freq
0 a 2
1 b 3
2 s 2...
Update just one gem with bundler
...undle update
> ruby -v
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin19]
> gem -v
3.0.3
> bundle -v
Bundler version 2.1.4
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离线版启动超时，有报错日志 - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
...ed\tmp" -Dfile.encoding=UTF-8
Picked up _JAVA_OPTIONS: -Xms64m -Xmx4G
Exception in thread "main" java.lang.NoClassDefFoundError: javax/ws/rs/core/Configurable
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
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Lua string to int
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In Lua 5.3, (64-bit default) integers are treated accordingly (lua.org/manual/5.3/manual.html): "A numeric constant with a fractional dot or an exponent denotes a float; otherwise it denotes an integer."
– Kevin Lee
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How to draw an empty plot?
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64
I suggest that someone needs to make empty plot in order to add some graphics on it later. So, ...