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What's the best way to join on the same table twice?
...n the SomeOtherFields would be null. If you want to make sure you have at least one matching phone number you could then do WHERE t2.PhoneNumber IS NOT NULL OR t3.PhoneNumber IS NOT NULL
The second method could have a problem: what happens if Table2 has both PhoneNumber1 and PhoneNumber2? Which r...
How to use SVN, Branch? Tag? Trunk?
...sary to build an executable (or system) into the repository; That means at least source code and make file (or project files for Visual Studio). But when we have icons and config files and all that other stuff, that goes into the repository. Some documentation finds its way into the repo; certainl...
Difference between Visual Basic 6.0 and VBA
...er In this case, it almost feels like MS treats VB.Net a variant of VB, at least based on the visual studio vb page - which would not be accurate. Oddly enough, this wiki article provides more information on its face than the MS visual studio page :) en.wikipedia.org/wiki/Visual_Basic_.NET. However,...
Parsing JSON from XmlHttpRequest.responseJSON
...eval anything you get from an outside source. Instead, use JSON.parse (at least in FF 3.5 and later).
– Ben Combee
Dec 29 '09 at 6:25
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Forward declaring an enum in C++
...'s enum class as a C++ extension (before C++11's different enum class), at least if I remember correctly. The compiler allowed you to specify an enum's underlying type, but didn't support enum class or forward-declared enums, and warned you that qualifying an enumerator with the enum's scope was a ...
What is a race condition?
...A data race occurs when 2 instructions access the same memory location, at least one of these accesses is a write and there is no happens before ordering among these accesses. Now what constitutes a happens before ordering is subject to a lot of debate, but in general ulock-lock pairs on the same lo...
What is meant by “managed” vs “unmanaged” resources in .NET?
...em, and you probably want to
Dispose() of them as soon as you can, or at least offer your callers
the opportunity to do so. That's where writing your own Dispose()
method comes in. Essentially, implementing IDisposable() does two
things for you:
Allows you to get rid of any resources...
How to keep the local file or the remote file during merge using Git and the command line?
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I went through at least five stackoverflow answers before finding this, which is what I wanted. Thanks.
– Bolton Bailey
May 18 '19 at 8:13
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Is it possible to change the package name of an Android app on Google Play?
...the users who already installed it won't have access to it anymore, but at least the potential new users won't find it on the market.
Not ideal and can be annoying to the users, sometimes even impossible to implement due to the status/possibilities of the app. But since Google left us no choice th...
HashMap get/put complexity
...nt time).
However what isn't often mentioned is, that with probability at least 1-1/n (so for 1000 items that's a 99.9% chance) the largest bucket won't be filled more than O(logn)! Hence matching the average complexity of binary search trees. (And the constant is good, a tighter bound is (log n)*(...