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How important is the order of columns in indexes?
...'s easier if you picture how the index must be traversed across, column 1, then column 2, etc...you see that lopping off most of the results in the fist pass makes the 2nd step that much faster.
Another case, if you queried on column 3, the optimizer wouldn't even use the index, because it's not ...
通过FastCGI Cache实现服务降级 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...y_lua '
get_fault_key = function(timestamp)
if not timestamp then
timestamp = ngx.time()
end
return os.date("fault:minute:%M", timestamp)
end
get_fault_num = function(timestamp)
local status = ngx.shared.status
local key = ...
When should assertions stay in production code? [closed]
...same section, this advice is given:
For highly robust code, assert and then handle the error anyway.
I think that as long as performance is not an issue, leave the assertion in, but rather than display a message, have it write to a log file. I think that advice is also in Code Complete, but I'...
Copy Notepad++ text with formatting?
...ay I preserve line feed is by exporting to HTML, opening the HTML in Word, then copying from there to whichever source I need to send code to (e.g. OneNote).
– Joe Greene
Mar 14 '17 at 2:07
...
What is “assert” in JavaScript?
...added to my code inside the if(!condition) is setting var throwError=true; then debugger; then wrap the throw section in an if(throwError). That way, if I have the debugger open, it'll break, and if I so desire I can set throwError to false and then examine all the scopes while stepping out.
...
How do you tell if a string contains another string in POSIX sh?
...1"
substring="$2"
if test "${string#*$substring}" != "$string"
then
return 0 # $substring is in $string
else
return 1 # $substring is not in $string
fi
}
contains "abcd" "e" || echo "abcd does not contain e"
contains "abcd" "ab" && echo "abcd contai...
Is it possible to GROUP BY multiple columns using MySQL?
...ROM table
GROUP BY col1, col2
The results will first be grouped by col1, then by col2. In MySQL, column preference goes from left to right.
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Safely remove migration In Laravel
...on, the "proper" way is to run migrate:rollback to rollback the migration, then delete the migration file and dump autoload. No need to hack the db or the migrations table.
– Jake Wilson
Jun 28 '14 at 0:47
...
New to unit testing, how to write great tests? [closed]
...ou are interested in finding out whether your private code is being tested then use a code coverage tool. But don't get obsessed by this: 100% coverage is not a requirement.
If your method calls public methods in other classes, and these calls are guaranteed by your interface, then you can test tha...
pull/push from multiple remote locations
...
Long story short, git remote add all of your remotes individually… and then git config -e and add a merged‐remote. Assuming you have this repository config:
[remote "GitHub"]
url = git@github.com:elliottcable/Paws.o.git
fetch = +refs/heads/*:refs/remotes/GitHub/*
[branch "Master"]
...