大约有 14,000 项符合查询结果（耗时：0.0416秒） [XML]
setTimeout / clearTimeout problems
...the function. Otherwise, you get a brand new variable on each function invocation.
var timer;
function endAndStartTimer() {
window.clearTimeout(timer);
//var millisecBeforeRedirect = 10000;
timer = window.setTimeout(function(){alert('Hello!');},10000);
}
...
How to add a ScrollBar to a Stackpanel
In my WPF application, I have a Stackpanel containing several controls inside them. How can I add a Scrollbar to this stackpanel.
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Error in SQL script: Only one statement is allowed per batch
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Great catch. Wow, Microsoft, seriously?? How is that error or its message intuitive in any way, shape, or form?
– Mike K
Nov 18 '14 at 17:45
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Plotting a list of (x, y) coordinates in python matplotlib
...ib.pyplot as plt
N = 50
x = np.random.rand(N)
y = np.random.rand(N)
plt.scatter(x, y)
plt.show()
will produce:
To unpack your data from pairs into lists use zip:
x, y = zip(*li)
So, the one-liner:
plt.scatter(*zip(*li))
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SELECT * WHERE NOT EXISTS
...ys return nothing unless there are no records at all in eotm_dyn, in which case it will return everything.
Assuming these tables should be joined on employeeID, use the following:
SELECT *
FROM employees e
WHERE NOT EXISTS
(
SELECT null
FROM eotm_dyn d
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jQuery Plugin: Adding Callback functionality
I'm trying to give my plugin callback functionality, and I'd like for it to operate in a somewhat traditional way:
6 Answer...
What is the way to quick-switch between tabs in Xcode 4
... CTRL + TAB is much better and not used by default. Pity that we can't bind last used tab.
– Pierre de LESPINAY
Jun 25 '13 at 11:20
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How to add a footer to a UITableView in Storyboard
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You can just drag a view to the bottom area of the tableView. You'll see in the hierarchy that it will be a subview of the tableview. You can then drag subviews such as labels and buttons there, adjust the height, etc.
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What is the difference between pluck and collect in Rails?
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"if you need some fields, use selectand collect" - can't you just use pluck with multiple attributes, like pluck(:id, :name)?
– Alexander
Dec 10 '14 at 15:03
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COUNT DISTINCT with CONDITIONS
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You can try this:
select
count(distinct tag) as tag_count,
count(distinct (case when entryId > 0 then tag end)) as positive_tag_count
from
your_table_name;
The first count(distinct...) is easy.
The second one, looks s...