How do you use PL/SQL to update a view?

Hi there, I know how to use SQL to create and update a view. I am using it to pull data for a specific date.
But now I want to find a way to parametized it (ie. the date) so that it can be run like a program each day (based on system date) to pull the latest data. I am thinking of using PL/SQL but not sure how it can be done.
DECLARE
run_date DATE := '10/12/2009';
BEGIN
END
Can someone shed some light on how I can update a view? Thanks alot.

Try this
DECLARE
run_date DATE := '10/12/2009';
BEGIN
execute imeediate 'create view view_name as select * from dual';
END

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