My friend, a student of economics, has "informative systems" for exams. Part of the exam is about sql. This is a fairly simple material, just picks. She has many written tests from a textbook.
I help her with the exercises, but I would like to have a simple program (linux or mac or, even better, a website ) where you can enter table structures with relationships (foreign keys), generate a sample data set and the ability to query it with a standard language sql.
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