At 22:37 05/09/22, Merlin Moncure wrote:

> >create or replace view VCurPlayer as select * from Player a
> >where a.AtDate = (select Max(b.AtDate) from Player b where a.PlayerID=
> >b.PlayerID);

Here is a trick I use sometimes with views, etc.  This may or may not be
effective to solve your problem but it's worth a shot.  Create one small
SQL function taking date, etc. and returning the values and define it
immutable.  Now in-query it is treated like a constant.

We don't use functions as a rule, but I would be glad to give it a try.
I would most appreciate if you could define a sample function and rewrite the VCurPlayer view above. Both PlayerID and AtDate are varchar fields.

Another useful application for this feature is when you have nested
views (view 1 queries view 2) and you need to filter records based on
fields from view 2 which are not returned in view 1.  Impossible?

in view 2 add clause where v2.f between  f_min() and f_max(), them being
immutable functions which can grab filter criteria based on inputs or
values from a table.


Best regards,

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