1. SQLZoo. It's nice because it offers indications and tutorials on several topics of interest.
2. SQLFiddle. Doesn't have tutorials, but it's ready for you to just type your queries.
The above should be OK for a quick test or practice. However, if you'd like to work on real data, then I think nothing comes even close to
3. STACKEXCHANGE DATA. Yes, you have real data available from all Stack Exchange websites. That includes over 6.5m Stackoverflow questions to query, not including users tables and what not. So excited I'm gonna hit the Publish button now and head to it.
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