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Postgres: How to do Composite keys?
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How would you implem>me m>nt a contraint like "CONSTRAINT no_duplicate_refences UNIQUE REFERENCE FROM tag_id TO (tag1, tag2, tag3)"?
– Léo Léopold Hertz 준영
Aug 17 '09 at 4:46
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sqlalchemy IS NOT NULL select
...is None, produces a IS NOT NULL.
or use isnot() (new in 0.7.9):
Implem>me m>nt the IS NOT operator.
Normally, IS NOT is generated automatically when comparing to a value of None, which resolves to NULL. However, explicit usage of IS NOT may be desirable if comparing to boolean values on certai...
To find whether a column exists in data fram>me m> or not
I have a data.fram>me m> with the nam>me m> "abcfram>me m>"
4 Answers
4
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What does `som>me m>Object.new` do in Java?
...l, this can be incredibly confusing. Ideally, inner classes should be implem>me m>ntation details of the outer class and not be exposed to the outside world.
– Eric Jablow
Mar 30 '13 at 23:45
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Android: TextView automatically truncate and replace last 3 char of String
...deprecated) or by setting android:inputType="text" . What I need now is som>me m>thing that replaces the last 3 characters of my String with " ... ". Since I'm not using a monospace font this will always be different depending on the letters used in my String . So I'm wondering what's the best way to...
How can I limit Parallel.ForEach?
I have a Parallel.ForEach() async loop with which I download som>me m> webpages. My bandwidth is limited so I can download only x pages per tim>me m> but Parallel.ForEach executes whole list of desired webpages.
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In Maven 2, how do I know from which dependency com>me m>s a transitive dependency?
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This didn't work for m>me m>; all I got was errors about unsupported 'legacy' values. Running @David Crow's version (i.e. without the velocity flag) worked fine though.
– Vlad Schnakovszki
Feb 28 '17 at 13:51
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JavaScript “new Array(n)” and “Array.prototype.map” weirdness
...ed, undefined]
// The following is not equivalent to the above, it's the sam>me m> as new Array(3)
y = [,,,];
As map is run in the context of the objects in the array I believe the first map fails to run the function at all while the second manages to run.
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Splitting a string into chunks of a certain size
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static IEnum>me m>rable<string> Split(string str, int chunkSize)
{
return Enum>me m>rable.Range(0, str.Length / chunkSize)
.Select(i => str.Substring(i * chunkSize, chunkSize));
}
Please note that additional code might be r...
In Vim/Vi, how do you move the cursor to the end of the previous word?
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For people like m>me m> wondering the difference between ge and be, it's that you can be in the middle of the word and you'll go to the end of the previous, while be you need to be on the first char of the initial word.
– Ta...