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MongoDb query condition on comparing 2 fields
...ind( { $where: function() { return this.Grade1 > this.Grade2 } } );
or more compact:
db.T.find( { $where : "this.Grade1 > this.Grade2" } );
UPD for mongodb v.3.6+
you can use $expr as described in recent answer
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Server.UrlEncode vs. HttpUtility.UrlEncode
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Access parent URL from iframe
...ll possible to get the URL depending on the context. See other answers for more details.
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Convert PDF to image with high resolution
...nswered Jul 7 '11 at 2:06
JBWhitmoreJBWhitmore
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Find first element in a sequence that matches a predicate
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@geekazoid: seq.find(&method(:predicate)) or even more concise for instance methods e.g.: [1,1,4].find(&:even?)
– jfs
Jul 20 '15 at 5:07
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Tables instead of DIVs [duplicate]
...le; use it when you have tabular data, but not otherwise.
Then you have a more semantic page and you don't need quite as many classes defined in your CSS; you can target the tags directly instead. Possibly most importantly, you have a page that will score much better with Google (anecdotally) than...
What's the difference between echo, print, and print_r in PHP?
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print and echo are more or less the same; they are both language constructs that display strings. The differences are subtle: print has a return value of 1 so it can be used in expressions whereas echo has a void return type; echo can take mult...
List goals/targets in GNU make that contain variables in their definition
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I agree that this is much nicer. Still more work than I hoped, but I'm going to mark it as the answer since nothing else seems to be reasonable and GNU make doesn't have a convenient flag for what I want.
– BitShifter
Sep 8 '...
How to check if a variable is null or empty string or all whitespace in JavaScript?
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A non-jQuery solution that more closely mimics IsNullOrWhiteSpace, but to detect null, empty or all-spaces only:
function isEmptyOrSpaces(str){
return str === null || str.match(/^ *$/) !== null;
}
...then:
var addr = ' ';
if(isEmptyOrSpaces(a...
Match multiline text using regular expression
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They both mean the same; [\s\S] is a bit more explicit ("match any character that is either whitespace or non-whitespace"), . is easier to read, but you need to look for the (?s) or DOTALL modifier in order to find out whether newlines are included or not. I'd prefe...