Re: Add Foreign Keys To Table

On 07/07/11 10:40 AM, Rich Shepard wrote:
> I'm having difficulty finding the correct syntax to modify an existing
> table. The modification is to add two columns, each a foreign
> reference to
> the two key columns of another table.
>
> The other table:
>
> CREATE TABLE station_type (
> sta_type VARCHAR(50),
> secondary_type VARCHAR(50),
> natural_indic BOOL,
> PRIMARY KEY (sta_type, secondary_type)
> );
>
> When I try to alter the other table to add columns:
> sta_type VARCHAR(50) REFERENCES station_type(sta_type) and
> secondary_type VARCHAR(50) REFERENCES station_type(secondary_type)
> I get syntax errors.

Since your PK of station_type is a composite, your foreign key must also
be composite.

CREATE TABLE stuffed (
id serial;
otherestuffs text;
sta varchar(50),
sec varchar(50),
FOREIGN KEY (sta, sec) REFERENCES station_type(sta_type,
secondary_type) ;
);

--
john r pierce N 37, W 122
santa cruz ca mid-left coast