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MongoDb query condition on comparing 2 fields
...e aware it will be fairly slow (has to execute Javascript code on every record) so combine with indexed queries if you can.
db.T.find( { $where: function() { return this.Grade1 > this.Grade2 } } );
or more compact:
db.T.find( { $where : "this.Grade1 > this.Grade2" } );
UPD for mongodb v.3.6+...
Why use sprintf function in PHP?
I am trying to learn more about the PHP function sprintf() but php.net did not help me much as I am still confused, why would you want to use it?
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Find kth smallest element in a binary search tree in Optimum way
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The solution that I have in my mind is doing the operation in O(n), the worst case since I am planning to do an inorder traversal of the entire tree. But deep down I feel that I am not using the BST property here. Is my assumptive solution correct or is there a better one available ?
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In Gradle, how do I declare common dependencies in a single place?
...eference that dependency from child modules without specifying the version or scope or whatever.
7 Answers
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What is sandboxing?
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A sandpit or sandbox is a low, wide container or shallow depression filled with sand in which children can play. Many homeowners with children build sandpits in their backyards because, unlike much playground equipment, they can be eas...
How can I drop all the tables in a PostgreSQL database?
How can I drop all tables in PostgreSQL, working from the command line?
24 Answers
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How do MySQL indexes work?
I am really interested in how MySQL indexes work, more specifically, how can they return the data requested without scanning the entire table?
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How do you overcome the svn 'out of date' error?
I've been attempting move a directory structure from one location to another in Subversion, but I get an Item '*' is out of date commit error.
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Mockito.any() pass Interface with Generics
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I confirm this answer works and correctly suppresses the warning.
– kevinarpe
Mar 17 '14 at 12:51
1
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Any reason to write the “private” keyword in C#?
..., protected , internal , etc. it will be private by default). (Please correct me if I am wrong.)
9 Answers
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