大约有 40,000 项符合查询结果（耗时：0.0376秒） [XML]
Drop data frame columns by name
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119
You could use %in% like this:
df[, !(colnames(df) %in% c("x","bar","foo"))]
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Oracle: how to UPSERT (update or insert into a table?)
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Tony AndrewsTony Andrews
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Find size of Git repository
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119
The git command
git count-objects -v
will give you a good estimate of the git repository's ...
How to get thread id from a thread pool?
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Is there a timeout for idle PostgreSQL connections?
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Delete with Join in MySQL
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119
It should be noted that this is the correct answer because the join forces you to use "DELETE posts FROM posts" instead of the normal "DEL...
When is “Try” supposed to be used in C# method names?
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119
(Corrected) There is official guideline, as Erik suggested.
When I see TrySomething method, ...
Is there a CSS parent selector?
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119
Yes: :has()
Browser support: none
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Reset select2 value and show placeholder
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119
The accepted answer does not work in my case. I'm trying this, and it's working:
Define selec...
How can I round a number in JavaScript? .toFixed() returns a string?
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119
I've solved this problem by changing this:
someNumber = someNumber.toFixed(2)
...to this:
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