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When and why are database joins expensive?
I'm doing some research into databases and I'm looking at some limitations of relational DBs.
7 Answers
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Remove 'a' from legend when using aesthetics and geom_text
...1:8),]
p <- ggplot(d, aes(wt, mpg)) +
geom_point() +
theme_classic(base_size = 18) +
geom_label_repel(
aes(label = rownames(d), fill = factor(cyl)),
size = 5, color = "white"
)
# Let's see what the default legend looks like.
p
# Now let's override some of the aesthetics:
p +...
ActiveRecord: List columns in table from console
...ething like Model.columns to get more info about the columns including database config data.
– srt32
Apr 21 '14 at 18:18
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Why is super.super.method(); not allowed in Java?
...hin the same method) but not your parent's. For example, suppose we have a base "collection of items", a subclass representing "a collection of red items" and a subclass of that representing "a collection of big red items". It makes sense to have:
public class Items
{
public void add(Item item)...
xUnit.net: Global setup + teardown?
...teardown extension point. However, it is easy to create one. Just create a base test class that implements IDisposable and do your initialization in the constructor and your teardown in the IDisposable.Dispose method. This would look like this:
public abstract class TestsBase : IDisposable
{
pr...
Render partial from different folder (not shared)
... public NewViewEngine() {
// Keep existing locations in sync
base.PartialViewLocationFormats = base.PartialViewLocationFormats.Union(NEW_PARTIAL_VIEW_FORMATS).ToArray();
}
}
Then in your Global.asax.cs file, add the following line:
ViewEngines.Engines.Add(new NewViewEngine());
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How to add text inside the doughnut chart using Chart.js?
...
None of the other answers resize the text based off the amount of text and the size of the doughnut. Here is a small script you can use to dynamically place any amount of text in the middle, and it will automatically resize it.
Example: http://jsfiddle.net/kdvuxbtj...
Web Service vs WCF Service
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This answer is based on an article that no longer exists:
Summary of article:
"Basically, WCF is a service layer that allows you to build applications that can communicate using a variety of communication mechanisms. With it, you can comm...
Why does ReSharper want to use 'var' for everything?
...use var for everything - I do lots and lots of code reviews using TFS (web based diffs) and it makes my job extremely difficult: i.e. var items = GetSomeItems(); vs IDataReader dr = GetSomeItems(); Missing using statement on both but easier for me to catch when using IDataReader vs var.
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How do I output coloured text to a Linux terminal?
...gnome-terminal, xterm, screen, ...). Then look that up in the terminfo database; check the colors capability.
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