Thread

views containing aggregates

PostgreSQL Bugs List <pgsql-bugs@postgresql.org> — 2000-08-27T03:31:16Z

NAGY Andras (nagya@inf.elte.hu) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
views containing aggregates

Long Description
Not sure, whether the `Views containing aggregates sometimes fail' and `Allow views of aggregate columns' entries from the TODO cover this, therefore the bug report.  An aggregate select from a view containing aggregates behaves differently as expected.  Even if the support for this is on TODO, until fixing this, postgres should print a warning or otherwise reject such use of views.

Sample Code
create table example (
   name  text
);
insert into example values('alpha');
insert into example values('alpha');
insert into example values('alpha');
insert into example values('alpha');
insert into example values('beta');
insert into example values('beta');
insert into example values('gamma');

-- the following should always return the number
-- of rows a simple `select * from relation' would return

select count(*) from example;
 count 
-------
     7
(1 row)


create view example_view as select name from example group by name;
select * from example_view;
 name  
-------
 alpha
 beta
 gamma
(3 rows)

-- however, it is not the case here

select count(*) from example_view;
 count 
-------
     4
     2
     1
(3 rows)



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