大约有 48,000 项符合查询结果（耗时：0.0398秒） [XML]
SQL: How to get the count of each distinct value in a column?
...
SELECT
category,
COUNT(*) AS `num`
FROM
posts
GROUP BY
category
share
|
improve this answer
|
follow
|
...
Maximum filename length in NTFS (Windows XP and Windows Vista)?
...16 you seam to have an option to ignore the MAX_PATH issue by overriding a group policy entry enable NTFS long paths under Computer Configuration -> Admin Templates -> System -> FileSystem:
– Steven Mark Ford
Nov 11 '16 at 7:58
...
How to use git merge --squash?
...h.
git merge --squash bugfix
Takes all commits from the bugfix branch and groups it for a 1 commit with your current branch.
(no merge commit appears; you could resolve conflicts manually before following commit)
git commit
Creates a single commit from the merged changes.
Omitting the -m parameter...
Why do loggers recommend using a logger per class?
...ly spring to mind:
Having a separate log for each class makes it easy to group together all log messages/errors pertaining to a given class.
Having a log within a class allows you to log internal details which may not be accessible outside the class (e.g., private state, information dealing with a...
What is the alternative for ~ (user's home directory) on Windows command prompt?
...nment these environment variables are governed by IT department through AD group policies as mentioned here and here.
– RBT
Aug 24 '17 at 5:10
...
How to check if a Unix .tar.gz file is a valid file without uncompressing?
....about.com/od/commands/l/blcmdl1_gzip.htm
from: http://unix.ittoolbox.com/groups/technical-functional/shellscript-l/how-to-test-file-integrity-of-targz-1138880
To test the gzip file is not corrupt:
gunzip -t file.tar.gz
To test the tar file inside is not corrupt:
gunzip -c file.tar.gz | tar -t...
Visual Studio, Find and replace, regex
...e the curly braces {} and the back reference \1: \n references to the n'th group indicated by curly braces in the search expression.
For versions Visual studio 2012 & up:
Starting with VS2012 .NET Framework regular expressions are used. So there it should be:
find include "([a-zA-Z]+\.h)",
repl...
Switch statement for string matching in JavaScript
...to convert the resulting array that must have only 1 element (no capturing groups) and whole string must be captured with quanitifiers (.*) to a string. In case of a failure the null object will become a "null" string. Not convenient.
str = 'haystack';
switch (str) {
case String(str.match(/^hay.*...
Script to get the HTTP status code of a list of urls?
...o extract the HTTP status code. That code is :
the second ($2) non-blank group of characters: {$2}
on the very first line of the header: NR==1
And because we want to print it... {print $2}.
wget --server-response --spider --quiet "${url}" 2>&1 | awk 'NR==1{print $2}'
...
How do I do a multi-line string in node.js?
...
var mystring = M(function(){/***
Ontario
Mining and
Forestry
Group
***/})
to get
mystring === "Ontario\nMining and\nForestry\nGroup"
And that's pretty much it.
How It Works
In Node.js, you can call the .toString method of a function, and it will give you the sou...