From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Guyren Howe <guyren(at)gmail(dot)com> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: How to add columns to view with dependencies |
Date: | 2017-04-17 03:52:31 |
Message-ID: | 24600.1492401151@sss.pgh.pa.us |
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Lists: | pgsql-general |
Guyren Howe <guyren(at)gmail(dot)com> writes:
> Seems like a simple question, but I’ve never found a good answer to this and similar issues.
> I would think it was safe to let me add columns to a view on which other views depend, but Postgres won’t let me.
> I can imagine ways of sort-of dealing with this. I might maintain a SQL file with views to create in a suitable order, Then I could drop all views, edit the definition of one, then run the file, but this is awfully tedious.
> What is best practice in this situation?
Hm ... all currently-supported versions of Postgres will allow, eg,
regression=# create table t1 (f1 int, f2 int, f3 int);
CREATE TABLE
regression=# create view v1 as select f1 from t1;
CREATE VIEW
regression=# create or replace view v1 as select f1, f2 from t1;
CREATE VIEW
regression=# create view v2 as select * from v1;
CREATE VIEW
regression=# create or replace view v1 as select f1, f2, f3 from t1;
CREATE VIEW
So I think your options are (1) explain what you're really doing,
or (2) update.
regards, tom lane
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