大约有 47,000 项符合查询结果（耗时：0.0657秒） [XML]
How does one reorder columns in a data frame?
... has four columns like so df[,c(1,2,3,4)].
Note the first comma means keep all the rows, and the 1,2,3,4 refers to the columns.
To change the order as in the above question do df2[,c(1,3,2,4)]
If you want to output this file as a csv, do write.csv(df2, file="somedf.csv")
...
How to get all Errors from ASP.Net MVC modelState?
I want to get all the error messages out of the modelState without knowing the key values. Looping through to grab all the error messages that the ModelState contains.
...
Are HTTP cookies port specific?
...e network attacker. Similarly, cookies for a given host are shared across all the ports on that host, even though the usual "same-origin policy" used by web browsers isolates content retrieved via different ports.
And also:
8.5. Weak Confidentiality
Cookies do not provide isolation by p...
Find all tables containing column with specified name - MS SQL Server
...
Not surprising it works on all those different databases given that INFORMATION_SCHEMA is part of the ANSI Standard
– Davos
May 24 '18 at 4:42
...
Edit the root commit in Git?
...kout <sha1-of-root>
# amend the commit
git commit --amend
# rebase all the other commits in master onto the amended root
git rebase --onto HEAD HEAD master
share
|
improve this answer
...
Can two applications listen to the same port?
...cation listening on a single port" that's the reason why ports exist -- to allow multiple applications to share the network without conflicts.
– S.Lott
Nov 7 '09 at 19:41
48
...
Script to kill all connections to a database (More than RESTRICTED_USER ROLLBACK)
...
Such a nice answer for aggregating kill statements all together. I would use a cursor to kill each process, which of course is not efficient at all. The technique used in this answer is brilliant.
– Saeed Neamati
Mar 2 '14 at 6:27
...
How to debug a single thread in Visual Studio?
...rrect and usable way is to:
Hit Ctrl+A in the breakpoints window (select all breakpoints).
Right click and select "Filter...".
Enter "ThreadId=(current thread id)".
In Visual Studio 2015 and newer, the process is similar:
Hit Ctrl+A in the breakpoints window (select all breakpoints).
Right cli...
What is the difference between background and background-color
...specific example there's no difference in the result, since background actually is a shorthand for
background-color
background-image
background-position
background-repeat
background-attachment
background-clip
background-origin
background-size
Thus, besides the background-color, usin...
What is the meaning of the 'g' flag in regular expressions?
...
g is for global search. Meaning it'll match all occurrences. You'll usually also see i which means ignore case.
Reference: global - JavaScript | MDN
The "g" flag indicates that the regular expression should be tested against all possible matches in a string.
Wit...