he/him 
Any recommendations for growing my SQL skills? Sure I know basic select and inner join stuff but it is clear that my weakness in this area is preventing me from being able to analyze large volumes of data in a meaningful way.
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Writing a SQL ORM is a pretty great way to learn all the syntax without having an actual real world use-case
Example of my shitty CoffeeScript ORM I wrote in 2012 https://github.com/kittens/amuzor/blob/master/system/orm.coffee …
