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- [Postrgresql](Postrgresql)
- <https://www.khanacademy.org/computing/hour-of-code/hour-of-sql/v/welcome-to-sql#>!
- <http://sqlfiddle.com/>
- <http://use-the-index-luke.com/de/sql/vorwort>
  
  From: <https://gist.github.com/hofmannsven/9164408>
  
  Login: mysql -u \[username\] -p
  
  show databases; use \[database\];

WHERE

JOIN