大约有 47,000 项符合查询结果（耗时：0.0560秒） [XML]
How to query nested objects?
...ndividual fields in the subdocument:
Equality matches within subdocuments select documents if the subdocument matches exactly the specified subdocument, including the field order.
In the following example, the query matches all documents where the value of the field producer is a subdocument tha...
Are there any side effects of returning from inside a using() statement?
...nCreated descending
where t.Id == singleId
select t).SingleOrDefault();
}
}
Indeed, I might even be tempted to use dot notation, and put the Where condition within the SingleOrDefault:
public static Transaction GetMostRecentTransaction(int singleId)
{
using...
What is this 'Lambda' everyone keeps speaking of?
... without bloating your code unnecessarily. For example, in Ruby:
(1..100).select {|num| num % 2 == 0}
This will create an array containing the even numbers between 1 and 100. We don't have to write out an explicit loop — the select method takes a function that it uses to test the values, so all...
How can I troubleshoot my Perl CGI script?
...rather than being buffered.
You have to set this for each filehandle. Use select to
change the default filehandle, like so:
$|++; #sets $| for STDOUT
$old_handle = select( STDERR ); #change to STDERR
$|++; #sets $| for STDERR
select( $old_hand...
How to cancel a pull request on github?
...e to the Original Repository where the pull request has been submitted to.
Select the Pull requests tab
Select your pull request that you wish to remove. This will open it up.
Towards the bottom, just enter a valid comment for closure and press Close Pull Request button
...
Verify if a point is Land or Water in Google Maps
...ue&with_field_names=true
You have to register and supply your key and selected layer number. You can search all their repository of available layers. Most of the layers are only regional, but you can find global also, like the World Coastline:
When you select a layer, you click on the "Service...
How to unset a JavaScript variable?
...all browsers. Running in real documents, your code examples are correct. I selected your answer as correct, but I'd appreciate it if you can edit it to include explaining window.a = 1; delete window.a; and possibly the mechanism. I can do so as well if you don't mind.
– Guss
...
Summarizing multiple columns with dplyr? [duplicate]
...
I mean, the behavior like in select would be great: summarize(df, a:c, d=paste(d, collaspe =',' ) . Just want to put more original columns in for reference
– biocyberman
Aug 8 '15 at 17:28
...
“On-line” (iterator) algorithms for estimating statistical median, mode, skewness, kurtosis?
...oints you have, in theory you only have to partially sort, e.g. by using a selection algorithm. However, that doesn't help too much with billions of values. I would suggest using frequency counts, see the next section.
Median and Mode with Frequency Counts
If it is integers, I would count
frequenc...
Chrome developer tools: View Console and Sources views in separate views/vertically tiled?
...Open the three-dot menu in the upper right corner of the dev tools window.
Select 'Settings'.
"General" tab --> "Appearance" section
"Panel Layout"
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