optimizing a view-driven query

if i've got a view that joins three or four tables, is there a
way to SELECT on that view to bypass any of the joins if they're
not needed in the result?

create view course as
select
_course.name as course,
_topic.name as topic,
_school.name as school,
_state.name as state,
_school.zip as zip
where
_course.topic = _topic.id
and
_topic.school = _school.id
and
_state.abbr = _school.state
;

select * from course ;
-- shows all fields via all tables

select topic from course where course like '%comput%' ;
-- not asking for state, we don't need to join the state table

here the optimizer might know we don't need to join the static
lookup '_state' table. can this be made to happen?

or is it just best to have "one view, one purpose"?

--
It is always hazardous to ask "Why?" in science, but it is often
interesting to do so just the same.
-- Isaac Asimov, 'The Genetic Code'

will(at)serensoft(dot)com
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