database - Modifying an Oracle number column -

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I have a table where there is a column number (22, 12) where the number should be (22,2). Since it has data in it, I can not just modify the column in the correct accuracy.

What would be the most effective way to go about setting up columns?

One thing I have not mentioned before is that the table has many indexes, connected to the trigger and other tables. 

  temporary radius trfoobar disabled; Add optional table fobers (newcomer number); Update Foober SET newcol = oldcol, oldcol = null; Alternative Table Foob Repair (OldCall Number (22.2)); Update Fubar SET oldcol = newcol; Alternative Table Fobre Drop (Nucleus); Enable Trigger Triobarph;

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