Question

I created views by CREATE VIEW lalala AS SELECT * FROM lalalala and I have two different views. How can I intersect them? view1 intersect view2 doesn’t work.

Answer 1

I think you might be misunderstanding the purpose of a view. A view is a sort of “derived” table, whose data depends on the data in (usually) one or more other tables. You still SELECT from it in the same way as a normal table. So, for example, if you have this:

CREATE VIEW lalala AS SELECT * FROM lalalala;

then you would query this view by writing:

SELECT * FROM lalala WHERE ...;

. . . which means that this view is, most likely, not useful; aside from questions of privileges and ownership and so on, lalala is equivalent to lalalala.

To compute the intersection of two views, you would write:

SELECT * FROM view1
INTERSECT
SELECT * FROM view2