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How do I find duplicates across multiple columns?
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Duplicated id for pairs name and city:
select s.id, t.*
from [stuff] s
join (
select name, city, count(*) as qty
from [stuff]
group by name, city
having count(*) > 1
) t on s.name = t.name and s.city = t.city
...
How do I run a terminal inside of Vim?
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Vim 8.1 now has a built in terminal that can be opened with the :term command. This provides much more complete integration with the rest of the Vim features.
I would definitely recommend screen for something like this. Vim is a text editor, not a shell.
I would use Ctrl+AS to split the current w...
What does it mean to “program to an interface”?
I have seen this mentioned a few times and I am not clear on what it means. When and why would you do this?
32 Answers
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How do I sort an observable collection?
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Sorting an observable and returning the same object sorted can be done using an extension method. For larger collections watch out for the number of collection changed notifications.
I have updated my code to improve performance (thanks to nawfal)...
Getting exact error type in from DbValidationException
...uation where I'm initializing my model in DatabaseInitializer() for EF 4.1 and get this annoying error "Validation failed for one or more entities. See 'EntityValidationErrors' property for more details." So, I go to this EntityValidationErrors and there is a field {System.Data.Entity.Validation....
When would you use delegates in C#? [closed]
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Now that we have lambda expressions and anonymous methods in C#, I use delegates much more. In C# 1, where you always had to have a separate method to implement the logic, using a delegate often didn't make sense. These days I use delegates for:
Event handler...
How to handle checkboxes in ASP.NET MVC forms?
...ubmit" />
<%}%>
Your checkboxes are all called selectedObjects, and the value of each checkbox is the GUID of the corresponding object.
Then post to the following controller action (or something similar that does something useful instead of Response.Write())
public ActionResult ShowData...
How can I install MacVim on OS X?
...vim
Step 4. Run brew link macvim
You now have the latest versions of vim and macvim managed by brew. Run brew update && brew upgrade every once in a while to upgrade them.
This includes the installation of the CLI mvim and the mac application (which both point to the same thing).
I use t...
Using git, how do I ignore a file in one branch but have it committed in another branch?
...certain, patched versions of git. See a new answer pointing to workarounds and another answer and subsequent comments for a hint which versions may work.
I wrote a blog post on how to effectively use the excludesfile for different branches, like one for public github and one for heroku deployment....
How to for each the hashmap? [duplicate]
...lways come back to this same answer. Upvoted, because this is clean answer and this code is copy pasted to so many places in my projects, thanks!
– Katu
Jan 23 '15 at 10:53
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