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mongodb count num of distinct values per field/key
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MongoDB has a distinct command which returns an array of distinct values for a field; you can check the length of the array for a count.
There is a shell db.collection.distinct() helper as well:
> db.countries.distinct('country');
[ "Spain", "...
How to merge a specific commit in Git
I have forked a branch from a repository in GitHub and committed something specific to me. Now I found the original repository had a good feature which was at HEAD .
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REST API Best practices: Where to put parameters? [closed]
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152
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CSS performance relative to translateZ(0)
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28
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throw checked Exceptions from mocks with Mockito
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extra: Mocktio will not complain if you doThrow an a method without any throwables, but you will also get this exception
– dwana
Sep 25 '15 at 7:36
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Difference between Pig and Hive? Why have both? [closed]
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Check out this post from Alan Gates, Pig architect at Yahoo!, that compares when would use a SQL like Hive rather than Pig. He makes a very convincing case as to the usefulness of a procedural language like Pig (vs. declarative SQL) and its utility to dataflow designers.
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How to exclude certain directories/files from git grep search
...it grep ? Something similar to the --exclude option in the normal grep command?
5 Answers
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How to test if one java class extends another at runtime?
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85
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What is the best way to do a substring in a batch file?
...y running batch file (unless executed in a subroutine called by call). The complete list of such “special” substitutions for path names can be found with help for, at the very end of the help:
In addition, substitution of FOR
variable references has been enhanced.
You can now use the fol...