ORA-32791：prebuilt table managed column cannot have a default on null
错误码
错误描述：prebuilt table managed column cannot have a default on null
错误原因：An attempt was made to create a materialized view on a prebuilt table that has a managed column with a default on null expression.
解决方法：Either remove the default on null property, or do not include the column in the materialized view definition.
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