shawn everett <[EMAIL PROTECTED]> writes:
> The basic select statement for my problem is going to work as follows:

> select colA, colB, colA+colB*0.4 as f1, colC, colC+colD*9 as f2 from table
> where date=SomeDateEnteredByTheUser;

OK, no problem:

create view myview as
select date, colA, colB, colA+colB*0.4 as f1, colC, colC+colD*9 as f2
from table;

Then your app does

select * from myview where date = SomeDateEnteredByTheUser;

(if you don't want to include the date in the display, you can't
just write * for the output columns, but hopefully you get the
idea now...)

                        regards, tom lane

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