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Learn SQL with Codecademy and Periscope - Learn SQL - the preferred tool of data analysts everywhere …

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Thanks for posting this Zach! Curious what the role of Periscope is here, if you care to elaborate =)
"Course developed in partnership with Periscope, The platform for SQL analysts" Haha now it makes sense. They're gonna have a tough time with that name for sure.
Haha, tell me about it! (I run marketing for Periscope). We've been around since 2012 and then those other guys had to come and start confusing people. And we're not the only ones dealing with it! . Besides the occasional person asking for help with "our" iphone app and people stopping me on the street when I wear our company shirt, it hasn't really been that bad, though.
Periscope.io has been around since 2012 too:
This is great.
currently taking a SQL class, i would've loved to have this beforehand.
As a self-taught marketer learning as I go along, I've needed this for a while - thank you (will let you know how I get along) ps - would be great to have an offline option, to learn while travelling etc
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Modern query optimization engines can do a lot of optimization for you, to the point where a lot of database developers and administrators don’t look into optimization techniques until the system starts to experience poor performance.