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generate days from date range
..., the performance is surprisingly good: the above query takes 0.0009 sec.
If we extend the subquery to generate approx. 100,000 numbers (and thus about 274 years worth of dates), it runs in 0.0458 sec.
Incidentally, this is a very portable technique that works with most databases with minor adjust...
NerdTree - Reveal file in tree
... :NERDTreeFind
Find the current file in the tree. If no tree exists for the current tab,
or the file is not under the current root, then initialize a new tree where
the root is the directory of the current file.
I don't think it's bound to anything by default, so y...
Can pandas automatically recognize dates?
...rser=dateparse)
You can find directives (i.e. the letters to be used for different formats) for strptime and strftime in this page.
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Change Checkbox value without triggering onCheckChanged
...lementation of setChecked:
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
// Avoid infinite recursions if setChecked() is called from a listener
if (mBroadcasting) {
return;
}...
How do I get a file's directory using the File object?
...rent() (or file.getParentFile()) to give you what you want.
Additionally, if you want to find out whether the original File does exist and is a directory, then exists() and isDirectory() are what you're after.
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Is it possible to set a custom font for entire of application?
...:
(Note: this is a workaround due to lack of support for custom fonts, so if you want to change this situation please do star to up-vote the android issue here). Note: Do not leave "me too" comments on that issue, everyone who has stared it gets an email when you do that. So just "star" it please.
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WHERE vs HAVING
... doing "WHERE 1" (writing the whole definition instead of a column name)
If your calculated expression does not contain any aggregates, putting it into the WHERE clause will most probably be more efficient.
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...sum + num
num = num + 1
end
print("sum =",sum)
if-else分支
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if age == 40 and sex =="Male" then
print("男人四十一枝花")
elseif age > 60 and sex ~="Female" then
print("old man without co...
what is .netrwhist?
...trwhist is a history file which maintains all the directories that were modified. So whenever you modify the contents of ~/.vim it adds one entry in .netrwhist
A sample .netrwhist is as shown
let g:netrw_dirhistmax =10
let g:netrw_dirhist_cnt =6
let g:netrw_dirhist_1='/Users/wolever/EnSi/repos/we...
Ruby on Rails: How do you add add zeros in front of a number if it's under 10?
... lot of people using sprintf (which is the right thing to do), and I think if you want to do this for a string it's best to keep in mind the rjust and ljust methods:
"4".rjust(2, '0')
This will make the "4" right justified by ensuring it's at least 2 characters long and pad it with '0'. ljust doe...