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Have alter the DUAL table(i.e. add a column) & it successfully added the column

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Have alter the DUAL table(i.e. add a column) & it successfully added the column
Stechies

I am facing a problem. pls. give me some suggestion to resolve the problem -

I have alter the DUAL table(i.e. add a column) & it successfully added the column, but now I can not drop that column(which is added previously), System giving an error - "Can not drop column from table owned by sys" .
Please help how to drop the added column from DUAL table.