ORA-00922 错误原因：missing or invalid option Cause An invalid option was specified in defining a column or storage clause. The valid option in specifying a column is NOT NULL to specify that the column cannot contain any NULL values. Only constraints may follow the datatype. Specifying a maximum length on a DATE or LONG datatype also causes this error. Action Correct the syntax. Remove the erroneous option or length specification from the column or storage specification.
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