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Continue to ChatdeletePluggableDatabase with DBCA in Oracle 18c http://oracle-help.com/oracle-18c/deletepluggabledatabase-with-dbca-in-oracle-18c/
deletePluggableDatabase with DBCA in Oracle 18c http://oracle-help.com/oracle-18c/deletepluggabledatabase-with-dbca-in-oracle-18c/