大约有 40,000 项符合查询结果（耗时：0.0498秒） [XML]
Foreign Key to multiple tables
...ulkon I know this is an old question but the query would be something like SELECT t.Subject AS ticketSubject, CASE WHEN u.Name IS NOT NULL THEN u.Name ELSE g.Name END AS ticketOwnerName FROM Ticket t INNER JOIN Party p ON t.Owner=p.PartyId LEFT OUTER JOIN User u ON u.ID=p.PartyId LEFT OUTER JOIN Gro...
Pass a data.frame column name to a function
...(x[,column])
}
fun1(df, "B", max)
Alternatively, using [[ also works for selecting a single column at a time:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[[column]])
}
fun1(df, "B")
...
Why .NET String is immutable? [duplicate]
...f the string class is. Strings don't have to be implemented as an array of chars, its wholly possible to implement strings as immutable ropes which have the interesting property of O(1) concats and O(lg n) substrings.
– Juliet
Aug 7 '10 at 0:19
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Background color of text in SVG
...or to SVG elements. You can do it programmatically with d3.
var text = d3.select("text");
var bbox = text.node().getBBox();
var padding = 2;
var rect = self.svg.insert("rect", "text")
.attr("x", bbox.x - padding)
.attr("y", bbox.y - padding)
.attr("width", bbox.width + (padding*2))
...
SQL - Rounding off to 2 decimal places
...
Could you not cast your result as numeric(x,2)? Where x <= 38
select
round(630/60.0,2),
cast(round(630/60.0,2) as numeric(36,2))
Returns
10.500000 10.50
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Custom attributes - Yea or nay?
...t known. For example, if it is some kind of integer id, we can't very well select for every possible case. We are then left to parse the class attribute manually which is definitely workable, but not as clear in the code, and in some cases, could be very slow (if there are a lot of candidate element...
How to get nth jQuery element
...
Why not browse the (short) selectors page first?
Here it is: the :eq() operator. It is used just like get(), but it returns the jQuery object.
Or you can use .eq() function too.
...
Where is svn.exe in my machine?
... program is installed.
In the installer, the command line tools need to be selected for this:
(If you have already installed TortoiseSVN, then rerun the installer and select "Modify")
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Phonegap Cordova installation Windows
... settings on the left.
Click Environment Variables under the Advanced tab.
Select the PATH variable and click Edit.
Copy the path mentioned above to the value field and press OK.
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How to branch with TortoiseHG
...
Before commiting, click on Branch button (see image), Then select a branch or create a new one (by typing where you select the branches).
See the image here
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