After 20 years in the field of Oracle database, I moved 2 years ago to Open Source database, Postgres. I`m EDB Certified Professional - Postgres Advanced Server, as EntrepriseDB is one the most active sponsor of Postgres. If you search one of the more advanced Open Source RDBMS have a look to Postgres: an awesome community, extensibility available since the origin more than 20 years ago, object-oriented RDBMS that includes NoSQL datatype like JSONB.
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