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Postgresql exercises
Basic querying — https://pgexercises.com/questions/basic/.
Joins — https://pgexercises.com/questions/joins/.
Data modification — https://pgexercises.com/questions/updates/.
Aggregations — https://pgexercises.com/questions/aggregates/.
That could be useful to refresh your memory. Not really up-to-date, but still pretty useful.
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