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Why use multiple columns as primary keys (composite primary key)
...nerated (non-intelligent) primary key, for example in this case OrderDetailId. But then you would not always see the relationship as easily. Some folks prefer one way; some prefer the other way.
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Sorting Python list based on the length of the string
...aced by the original elements.
Key parameter to specify a function to be called on each list element prior to making comparisons. docs
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MS-DOS Batch file pause with enter key
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There's a pause command that does just that, though it's not specifically the enter key.
If you really want to wait for only the enter key, you can use the set command to ask for user input with a dummy variable, something like:
set /p DUMMY=Hit ENTER to continue...
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN
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This question is already resolved, but...
...also consider the solution suggested by Wouter in his original comment. The ability to handle missing data, including dropna(), is built into pandas explicitly. Aside from potentially improved performance over doing it manually, these...
Can a class extend both a class and implement an Interface
Can a class extend both an interface and another class in PHP?
Basically I want to do this:
3 Answers
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Why do we have map, fmap and liftM?
...classopedia, page 20
fmap and liftM exist because monads were not automatically functors in Haskell:
The fact that we have both fmap and liftM is an
unfortunate consequence of the fact that the Monad type class does not require
a Functor instance, even though mathematically speaking, every ...
How to write an XPath query to match two attributes?
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//div[@id='..' and @class='...]
should do the trick. That's selecting the div operators that have both attributes of the required value.
It's worth using one of the online XPath testbeds to try stuff out.
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How to get the process ID to kill a nohup process?
...task in the background, the background operator (&) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process if needed, via kill PID or kill -9 PID (if you need to force kill). Alternatively, you can f...
How to get the index of an element in an IEnumerable?
... +1 for "questioning the wisdom". 9 times out of 10 it's probably a bad idea in the first place.
– Joel Coehoorn
Aug 17 '09 at 21:45
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How to calculate the SVG Path for an arc (of a circle)
....y
].join(" ");
return d;
}
to use
document.getElementById("arc1").setAttribute("d", describeArc(200, 400, 100, 0, 180));
and in your html
<path id="arc1" fill="none" stroke="#446688" stroke-width="20" />
Live demo
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