How to change the datatype in the oracle table?

Hi,
I need to change the datatype of the column in Oracle table. That column contains some data. I do not want to loose those data.
For altering a table/column condition are:
1. either table should not contain any data.
2. either that column should not contain any data.
Please suggest how i can handle this situation.
Thanks.

Hello,
Suppose you have currently datatype of column as VARCHAR and you want to convert it in NUMBER. Do following
1-Add another column with NUMBER datatype in your table.
ALTER table tablename
ADD testcolumn NUMBER;2-Update your actual column data to this test column.
UPDATE tablename
SET testcolumn = actualcolumn;
COMMIT;3-Update your actual column data to null;
UPDATE tablename
SET actualcolumn = NULL;
COMMIT;4-Change Datatype of actual column.
ALTER table tablename
MODIFY actualcolumn NUMBER;5-Update actualcolumn to testcolumn
UPDATE tablename
SET actualcolumn = testcolumn;
COMMIT;
please mark if it help you or correct
Regards,
Danish

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