大约有 21,900 项符合查询结果（耗时：0.0429秒） [XML]
#1071 - Specified key was too long; max key length is 1000 bytes
...ne the index. For example:
...
KEY `index` (`parent_menu_id`,`menu_link`(50),`plugin`(50),`alias`(50))
...
But what's the best prefix length for a given column? Here's a method to find out:
SELECT
ROUND(SUM(LENGTH(`menu_link`)<10)*100/COUNT(`menu_link`),2) AS pct_length_10,
ROUND(SUM(LENG...
Available text color classes in Bootstrap
... 4 (added in recent versions) not mentioned in other answers.
.text-black-50 and .text-white-50 are 50% transparent.
.text-body {
color: #212529 !important;
}
.text-black-50 {
color: rgba(0, 0, 0, 0.5) !important;
}
.text-white-50 {
color: rgba(255, 255, 255, 0.5) !important;
...
What's the 'Ruby way' to iterate over two arrays at once
...
>> @budget = [ 100, 150, 25, 105 ]
=> [100, 150, 25, 105]
>> @actual = [ 120, 100, 50, 100 ]
=> [120, 100, 50, 100]
>> @budget.zip @actual
=> [[100, 120], [150, 100], [25, 50], [105, 100]]
>> @budget.zip(@actual).each...
JavaScript: remove event listener
...t = 0;
function myClick(event) {
click_count++;
if(click_count == 50) {
// to remove
canvas.removeEventListener('click', myClick);
}
}
// to add
canvas.addEventListener('click', myClick);
EDIT: You could close around the click_counter variable like this:
var myClick ...
How can I get the actual stored procedure line number from an error message?
...
RickRick
3,85011 gold badge2424 silver badges2020 bronze badges
...
What does a double * (splat) operator do
...gt; foo 10, 20, 30
=> [10, [20, 30], {}]
> foo 10, 20, 30, d: 40, e: 50
=> [10, [20, 30], {:d=>40, :e=>50}]
> foo 10, d: 40, e: 50
=> [10, [], {:d=>40, :e=>50}]
share
|
i...
CSS Progress Circle [closed]
...wants to give it a try: gist.github.com/digitalbreed/84a19db69244b22519e03550ba010a25
– digitalbreed
Jan 2 '17 at 17:03
|
show 12 more comme...
Mean per group in a data.frame [duplicate]
... Group.1 Rate1 Rate2
1 Aira 16.33333 47.00000
2 Ben 31.33333 50.33333
3 Cat 44.66667 54.00000
Here we aggregate columns 3 and 4 of data.frame d, grouping by d$Name, and applying the mean function.
Or, using a formula interface:
aggregate(. ~ Name, d[-2], mean)
...
Max size of an iOS application
...
350
4GB's is the maximum size your iOS app can be.
As of January 26, 2017
App Size for iOS (& ...
How to “fadeOut” & “remove” a div in jQuery?
...aolo BergantinoPaolo Bergantino
434k7676 gold badges504504 silver badges431431 bronze badges
25
...