大约有 47,000 项符合查询结果（耗时：0.0635秒） [XML]
Ordering by specific field value first
...LD(name, "core", "board", "other")
If you only care that "core" is first and the other values don't matter:
SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core") DESC
If you want to sort by "core" first, and the other fields in normal sort order:
SELECT id, name, priority
FROM my...
MongoDB relationships: embed or reference?
...n a single document as you can. Because MongoDB documents have structure, and because you can efficiently query within that structure (this means that you can take the part of the document that you need, so document size shouldn't worry you much) there is no immediate need to normalize data like yo...
What's “requestCode” used for on PendingIntent?
...ded even in case the alarms' intents are very different (one for service A and one for service B , for example ) ? Also, how come the documentation doesn't say anything about it? Is it possible to remove all alarms of a certain type, no matter what is the requestCode?
– android...
how to concatenate two dictionaries to create a new one in Python? [duplicate]
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Slowest and doesn't work in Python3: concatenate the items and call dict on the resulting list:
$ python -mtimeit -s'd1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}' \
'd4 = dict(d1.items() + d2.items() + d3.items())'
100000 loops, bes...
How can I discard remote changes and mark a file as “resolved”?
I have some local files, I pull from remote branch and there are conflicts. I know that I would like to keep my local changes and ignore the remote changes causing conflicts. Is there a command I can use to in effect say "mark all conflicts as resolved, use local"?
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Java Equivalent of C# async/await?
...user960567: You need to distinguish between the version of C# you're using and the version of .NET you're using. async/await is a language feature - it was introduced in C# 5. Yes, you can use Microsoft.Bcl.Async to use async/await targeting .NET 4, but you've still got to use a C# 5 compiler.
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How to calculate the bounding box for a given lat/lng location?
I have given a location defined by latitude and longitude.
Now i want to calculate a bounding box within e.g. 10 kilometers of that point.
...
What is reflection and why is it useful?
What is reflection, and why is it useful?
21 Answers
21
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Get the first item from an iterable that matches a condition
...the only argument.
I see most answers resolutely ignore the next built-in and so I assume that for some mysterious reason they're 100% focused on versions 2.5 and older -- without mentioning the Python-version issue (but then I don't see that mention in the answers that do mention the next built-in...
Difference between toFixed() and toPrecision()?
I'm new to JavaScript and just discovered toFixed() and toPrecision() to round numbers. However, I can't figure out what the difference between the two is.
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