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How to shrink/purge ibdata1 file in MySQL

I am using MySQL in localhost as a "query tool" for performing statistics in R, that is, everytime I run a R script, I create a new database (A), create a new table (B), import the data into B, submit a query to get what I need, and then I drop B and drop A. ...
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“NODE_ENV” is not recognized as an internal or external command, operable command or batch file

I'm trying to setup an environment for a Node.js app. but I'm getting this error every time. 15 Answers ...
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Counting the number of option tags in a select tag in jQuery

How do I count the number of <option> s in a <select> DOM element using jQuery? 8 Answers ...
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Use email address as primary key?

Is email address a bad candidate for primary when compared to auto incrementing numbers? 25 Answers ...
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What does FrameLayout do?

I'm new to programming. I was using Graphical Layout then when I was reading xml file, I saw FrameLayout. Then I searched, but I couldn't find something useful. What is FrameLayout and what does it do? ...
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Problems with pip install numpy - RuntimeError: Broken toolchain: cannot link a simple C program

I'm trying to install numpy (and scipy and matplotlib) into a virturalenv. 11 Answers ...
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Spring mvc @PathVariable

Can you give me a brief explanation and a sample in using @PathVariable in spring mvc? Please include on how you type the url? I'm struggling in getting the right url to show the jsp page. Thanks. ...
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Generate a random date between two other dates

How would I generate a random date that has to be between two other given dates? 26 Answers ...
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Why are all fields in an interface implicitly static and final?

I am just trying to understand why all fields defined in an Interface are implicitly static and final . The idea of keeping fields static makes sense to me as you can't have objects of an interface but why they are final (implicitly)? ...
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Random record in ActiveRecord

I'm in need of getting a random record from a table via ActiveRecord. I've followed the example from Jamis Buck from 2006 . ...