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ORA-02000: missing … keyword

In Oracle 23c or later, the following statement throws ORA-02000: missing END keyword because the case when expression is not terminated with end: 
select
   case when owner in ('SYS', 'SYSTEM') then 'n/a'
from
   dba_tables;
In Releases prior to 23c, Oracle throws ORA-00905: missing keyword.

See also

Other Oracle error messages

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