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I'm used to practice my coding skills using an Online Judge like Project Euler or Codeforces, when I try to learn new programming languages. But it seems this cannot be applied to SQL.

Are there any good online websites where I can practice using SQL?

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closed as off topic by Dynamic, Walter, Glenn Nelson, gnat, ChrisF♦ Dec 27 '12 at 12:05

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Check out SQL Fiddle. It's a very robust online playground to learn SQL and quickly get hands-on experience with writing SQL queries and building a schema.

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would you mind expanding a bit on what each of these resources have and why do you recommend these as answering the question asked? "Link-only answers" are not quite welcome at Stack Exchange – gnat Mar 31 at 2:31
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@gnat I think it's pretty obvious, but I'll expand on the answer a bit. – Neeko Apr 1 at 16:18
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Honestly, I would download mySql or SQL Server Express and install it...

But to answer your question, you could use the Stack Exchange Data Explorer . You can query all the the SE data, the schema is already set up and its a real life example with all complexities that is needed to support a real time reporting system.

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