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How do MySQL indexes work?
...n do something like this:
SELECT url FROM url_table WHERE url_hash=CRC32("http://gnu.org");
The problem with the above example is that since the CRC32 function generates a quite small hash, you'll end up with a lot of collisions in the hashed values. If you need exact values, you can fix this pro...
mongoDB/mongoose: unique if not null
...ield with a value of null, only multiple docs without an email field.
See http://docs.mongodb.org/manual/core/index-sparse/
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A beginner's guide to SQL database design [closed]
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I started out with this article
http://en.tekstenuitleg.net/articles/software/database-design-tutorial/intro.html
It's pretty concise compared to reading an entire book and it explains the basics of database design (normalization, types of relationships) v...
C++ const map element access
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Data Modeling with Kafka? Topics and Partitions
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What's the difference between interface and @interface in java?
... goes here
}
PS:
Many annotations replace comments in code.
Reference: http://docs.oracle.com/javase/tutorial/java/annotations/declaring.html
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C# using streams
...
I would start by reading up on streams on MSDN:
http://msdn.microsoft.com/en-us/library/system.io.stream.aspx
Memorystream and FileStream are streams used to work with raw memory and Files respectively...
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Reading a delimited string into an array in Bash
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How do I disable the security certificate check in Python requests
... SSL certificate if you set
verify to False.
>>> requests.get('https://kennethreitz.com', verify=False)
<Response [200]>
If you're using a third-party module and want to disable the checks, here's a context manager that monkey patches requests and changes it so that verify=False...
What is the difference between compare() and compareTo()?
...ve one natural sorting order, you may not need compare().
Summary from http://www.digizol.com/2008/07/java-sorting-comparator-vs-comparable.html
Comparable
A comparable object is capable of comparing itself with another object.
Comparator
A comparator object is capable of comparing two differe...