I using 8.0.1. I create 3 tables with these definitions:
create table t1 (serv_id varchar(50) not null);
create table t2 (serv_id varchar(50) not null);
create table t3 (serv_id varchar(50) not null);
Now I create a view like this:
create or replace view v1 as select * from t1;
Next, I attempt to update this view like this:
create or replace view v1 as select * from t1 union select * from t2;
I receive: ERROR: cannot change data type of view column "serv_id"
Next, I drop view v1 and recreate it using the union above. I am now
able to do the following without error:
create or replace view v1 as select * from t1 union select * from t2
union select * from t3;
So it looks like changing a view from a non-union to a union is
producing an error, but changing a view that already contains a 2-way
union to one that contains a 3-way union is allowed (and I'm assuming
any n to n+1 union transition is also allowed.)
Is this intentional? It was certainly not predictable.
--
Guy Rouillier
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