Function o know the value of nth column of a query

Hi,
I want to create a function where the input will be some sql statement (select statement) and the output will be the the value of 2nd column(or say nth column) knowing only column position (say 2 or 3 or n)
I know this is possible through DBMS_SQL but do not know how.
Please let me know how to do this.
Regards
Surendra

I'm not sure to understand as well, but you could read the following doc, especially the example 8 which seems to be close of what you want to do :
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_sql.htm#i997238
Nicolas.

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For any DML (Insert, Update or Delete) oracle internally fires the row level triggers.Any pointer to the documentation supporting this ?
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Function o know the value of nth column of a query

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