大约有 13,071 项符合查询结果(耗时:0.0350秒) [XML]

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How to template If-Else structures in data-bound views?

I constantly find myself using this idiom in KO-based HTML templates: 4 Answers 4 ...
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How to include “zero” / “0” results in COUNT aggregate?

I've just got myself a little bit stuck with some SQL. I don't think I can phrase the question brilliantly - so let me show you. ...
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Is an index needed for a primary key in SQLite?

When an integer column is marked as a primary key in an SQLite table, should an index be explicitly created for it as well? SQLite does not appear to automatically create an index for a primary key column, but perhaps it indexes it anyway, given its purpose? (I will be searching on that column all t...
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Check if a value is within a range of numbers

I want to check if a value is in an accepted range. If yes, to do something; otherwise, something else. 7 Answers ...
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NSDefaultRunLoopMode vs NSRunLoopCommonModes

Whenever I try to download a big file behind UIScrollView , MPMapView or something, the downloading process gets halted as soon as I touch iPhone screen. Thankfully, an awesome blog post by Jörn suggests an alternative option, using NSRunLoopCommonModes for connection. ...
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Converting dict to OrderedDict

I am having some trouble using the collections.OrderedDict class. I am using Python 2.7 on Raspbian, the Debian distro for Raspberry Pi. I am trying to print two dictionaries in order for comparison (side-by-side) for a text-adventure. The order is essential to compare accurately. No matter what I...
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How to return a part of an array in Ruby?

With a list in Python I can return a part of it using the following code: 6 Answers 6 ...
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How to change the default collation of a table?

creates a table with the default collation latin1_general_ci ; 4 Answers 4 ...
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Sending a notification from a service in Android

I have a service running, and would like to send a notification. Too bad, the notification object requires a Context , like an Activity , and not a Service . ...
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How to do an INNER JOIN on multiple columns

I'm working on a homework project and I'm supposed to perform a database query which finds flights either by the city name or the airport code, but the flights table only contains the airport codes so if I want to search by city I have to join on the airports table. ...