ORA-18270：key or alternate key attributes "string" and "string" for level "string" have string mismatched NULL values
错误码
错误描述：key or alternate key attributes "string" and "string" for level "string" have string mismatched NULL values
错误原因：There was a mismatch in the number of NULL values for a SKIP WHEN NULL level.
解决方法：Ensure that for each SKIP WHEN NULL level, either all level key column values and alternate key attributes are NULL, or all of the level key column values and alternate key attributes are not NULL.
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