Cause
A drop subpartition command is being executed when there is only one subpartition in the partition
A drop subpartition command is being executed when there is only one subpartition in the partition
Issue a SPLIT of the DEFAULT subpartition and then MERGE the split subpartition into the subpartition to which values need to be added
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/9449498
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