Oracle Error Message
ORA-14188: sub-partitioning columns must form a subset of key columns of a UNIQUE index
Reason for the Error
User attempted to create a UNIQUE partitioned index whose sub-partitioning columns do not form a subset of its key columns which is illegal
Solution
If the user, indeed, desired to create an index whose subpartitioning columns do not form a subset of its key columns, it must be created as non-UNIQUE; otherwise, correct the list of key and/or subpartitioning columns to ensure that the index’ subpartitioning columns form a subset of its key columns