So CREATE a table eg:
CREATE TABLE fks_for_tables
( fks_id serial
fks_values varchar(20),
CONSTRAINT fks_pkey PRIMARY KEY (fks_id),
CONSTRAINT fks-unique UNIQUE fks_values
)
Then
INSERT INTO fks_for_tables
(fks_values)
VALUES
( 'Agriculture'),
('Business'),
('other))',
'Chemicals')
...
...
('Transportation');
Then you can
ALTER TABLE your_table
ADD CONSTRAINT FOREIGN KEY (industry)
REFERENCES fks_for_tables(fks_valies);
On Mon, 17 Dec 2018, Melvin Davidson wrote:
> Yes, you must drop then add the revised constraint. However, from your
> statement above, it sounds to me as if you would be better off using A
> FOREIGN kEY CONSTRAINT. It makes things a lot simpler.
Melvin,
I don't follow. Here's the DDL for that column:
industry varchar(24) NOT NULL
CONSTRAINT invalid_industry
CHECK (industry in ('Agriculture', 'Business, other', 'Chemicals',
'Energy', 'Law', 'Manufacturing', 'Mining', 'Municipalities',
'Ports/Marine Services', 'Transportation')),
and I want to remove Municipalities for the more general Government.
Regards,
Rich
--
Melvin Davidson
Maj. Database & Exploration Specialist
Universe Exploration Command – UXC
Employment by invitation only!
