* Keith Worthington <keithw@narrowpathinc.com> [2004-10-19 15:01:40 -0400]:
> Table "myschema.tbl_part"
> Column | Type | Modifiers
> ----------------------+------------------------+-----------
> sales_gl_account | character varying(15) |
>
> Table "myschema.tbl_gl_account"
> Column | Type | Modifiers
> -------------+-----------------------+-----------
> number | character varying(15) | not null
>
> Is it possible to create a foreign key such that only null and
> values from myschema.tbl_gl_account.number are allowed in
> myschema.tbl_part.sales_gl_account?
How is this any different than a regular foreign key constraint?
ALTER TABLE tbl_part ADD CONSTRAINT account_number_exists FOREIGN KEY
(sales_gl_account) REFERENCES tbl_gl_account(number);
HTH,
--
Steven Klassen - Lead Programmer
Command Prompt, Inc. - http://www.commandprompt.com/
PostgreSQL Replication & Support Services, (503) 667-4564
