On 11/14/19 7:54 AM, Adrian Klaver wrote:
On 11/14/19 7:45 AM, Tom Lane wrote:
Adrian Klaver <adrian.klaver@xxxxxxxxxxx> writes:
On 11/14/19 7:12 AM, Tom Lane wrote:
If you actually want to rename an existing view column, use
ALTER TABLE ... RENAME COLUMN ... for that.
Alright, I'm missing something here:
test=# alter table up_test rename COLUMN col1 to col_1;
ALTER TABLE
...
test=# \d+ test_view
View "public.test_view"
Column | Type | Collation | Nullable | Default | Storage |
Description
--------+---------+-----------+----------+---------+---------+-------------
id | integer | | | | plain |
col1 | boolean | | | | plain |
col_2 | integer | | | | plain |
View definition:
SELECT up_test.id,
up_test.col_1 AS col1,
up_test.col_2
FROM up_test;
Right, at this point the names of the underlying column and the view
column are out of sync, so the view definition must incorporate a
renaming AS to be correct.
test=# create or replace view test_view as select id, col_1 , col_2 from
up_test;
ERROR: cannot change name of view column "col1" to "col_1"
This is attempting to change the view output column's name to col_1
(since you didn't write "AS col1"), and it won't let you. You could
do "ALTER TABLE test_view RENAME COLUMN col1 TO col_1" to put things
back in sync, if that's what you want.
Aah. You do ALTER TABLE on the view, that was the part I missed.
Yeah an ALTER VIEW ... version of that would be more intuitive.
Or a link back to the ALTER TABLE section in the CREATE OR REPLACE VIEW
portion of:
https://www.postgresql.org/docs/11/sql-createview.html
regards, tom lane
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
