Re: How can I delete a primary or foreign key?

tibor wrote:
> I forgot to mention that I have tried numerous variations.
> The one quoted in the original mail was from "The Complete Reference" series.
> I've also tried the one that the \h command suggests:
>
> ALTER TABLE PARENTS DROP CONSTRAINT FOREIGN KEY (TYPE) CASCADE;
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

You are forgetting the name of the constraint.

Sincerely,

Joshua D. Drake




>
> but all I got was:
>
> ERROR:  syntax error at or near "foreign" at character 37
>
> the DROP CONSTRAINT clause doesn't recognise either PRIMARY or FOREIGN KEY
> option. (not implemented, I guess)
>
> On Friday 20 Feb 2004 16:42, you wrote:
>
>>On Fri, 20 Feb 2004, Tibor wrote:
>>
>>>I am using PostgreSQL 7.4.1 (only through psql)
>>>I know, that the command
>>>
>>>ALTER TABLE OFFICES
>>>    DROP PRIMARY KEY (CITY);
>>>
>>>and its foreign key equivalent:
>>>
>>>ALTER TABLE SALESREPS
>>>    DROP CONSTRAINT
>>>FOREIGN KEY (REP_OFFICE)
>>>    REFERENCES OFFICES;
>>>
>>>don't work in PostgreSQL because they are not implemented. However, isn't
>>>there another way of removing them?
>>
>>That's not the correct syntax for ALTER TABLE ... DROP CONSTRAINT.
>>
>>ALTER TABLE tablename DROP CONSTRAINT constraint_name [RESTRICT | CASCADE]
>
>


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