Oracle SQL - Free/Dummy Databases for Query Practice?

Hey all,

I'm a little rusty on my Oracle SQL skills and want to brush up. Does anyone have any cool resources for dummy databases for practicing?

The more the better! :smiley:

I think it existed somewhat forever, You can install some examples with Oracle SQL 12c

https://docs.oracle.com/database/121/COMSC/overview.htm#COMSC005

Northwind database

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