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How to get the first line of a file in a bash script?

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What is a sealed trait?

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How to find all tables that have foreign keys that reference particular table.column and have values

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Redis strings vs Redis hashes to represent JSON: efficiency?

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Easiest way to toggle 2 classes in jQuery

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Why does Google +1 record my mouse movements? [closed]

... I think that the paper by Guo and Agichtein from CHI 2010 http://www.mathcs.emory.edu/~qguo3/wip287-guo11.pdf can provide further ideas on why Google is doing that. Apparently mouse movements is a rough proxy for eye movement and allows people to approximate eye tracking results. ...
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Is it fine to have foreign key as primary key?

...the foreign key refers will always be valid (or null, if allowed). http://www.aisintl.com/case/primary_and_foreign_key.html share | improve this answer | follow ...
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get and set in TypeScript

...ways stay up-to-date as changes are made, and shows example usage: http://www.typescriptlang.org/docs/handbook/classes.html In particular, for those not familiar with it, note that you don't incorporate the word 'get' into a call to a getter (and similarly for setters): var myBar = myFoo.getBar(...
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How to get all enum values in Java?

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SQL RANK() versus ROW_NUMBER()

...mber is the distinct rank of rows, without any gap in the ranking. http://www.bidn.com/blogs/marcoadf/bidn-blog/379/ranking-functions-row_number-vs-rank-vs-dense_rank-vs-ntile share | improve this ...