ORA-14285：cannot COALESCE the only partition of this hash partitioned table or index
错误码
错误描述：cannot COALESCE the only partition of this hash partitioned table or index
错误原因：A COALESCE PARTITION command was issued when there is only one partition in the table or index, which is illegal
解决方法：Ensure that there is at least one partition. Drop the table or index to remove all partitions.
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