Re: [HACKERS] Views on aggregates - need assistence

On Mon, 23 Feb 1998, Bruce Momjian wrote:

> > 
> > On Mon, 23 Feb 1998, Bruce Momjian wrote:
> > 
> > > Actually, it does handle unions of views, but not views of unions. 
> > > Informix doesn't support it either, and I don't know what the other
> > > dbms's do, but I think I am going to find out soon from someone.  :-)
> > 
> > 	What exactly would you like me to try here? *raised eyebrow*
> > 
> > 
> > 
> 
> 
> 	create view as
> 		select oid from pg_user union select oid from pg_class
> 
> or something like that.  That will not work under PostgreSQL.  But you
> can use views as part of a union:
> 
> 	select oid from view1
> 	union
> 	select oid from view2

You mean like:

SQL> select * from one
  2  ;

         A
----------
         3
         4
         2

SQL> create table two ( B int );

Table created.

SQL> insert into two values ( 1 );

1 row created.

SQL> insert into two values ( 2 ) ;

1 row created.

SQL> insert into two values ( 3 ) ;

1 row created.

SQL> create view v1 as select A from one union select B from two;

View created.

SQL> select * from v1;

         A
----------
         1
         2
         3
         4