Twitter is running on cassandra ( a NOSQL database )--> nosql database means non-relationational database
http://guyharrison.squarespace.com/blog/2010/8/23/playing-with-cassandra-and-oracle.html
Partition by Expression
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Oracle 26.1 now allows using an *Expression* in the Partitioning Clause.
In earlier releases, you could do this with a Virtual Column defined in the
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