On Fri, Mar 25, 2005 at 04:31:16PM +0100, ASAKALAL@bouyguestelecom.fr wrote:
>
> When i add table with foreign key in my database, this error return : <
> number of referencing and referenced colums for foreign key disagree>.
Apparently the referencing key (the foreign key specification) has
a different number of columns than the referenced key (the primary
key or other unique key in the referenced table). Here's an example
that illustrates the problem:
CREATE TABLE foo ( pk1 integer NOT NULL, pk2 integer NOT NULL, PRIMARY KEY (pk1, pk2) -- 2-column
primarykey ); CREATE TABLE bar ( fk integer NOT NULL REFERENCES foo -- 1-column foreign key ); ERROR: number
ofreferencing and referenced columns for foreign key disagree
In the above example we need a 2-column foreign key:
CREATE TABLE bar ( fk1 integer NOT NULL, fk2 integer NOT NULL, FOREIGN KEY (fk1, fk2) REFERENCES foo );
Here's another example that references a 1-column unique key that
isn't a primary key:
CREATE TABLE foo ( pk1 integer NOT NULL, pk2 integer NOT NULL, x integer NOT NULL, PRIMARY KEY
(pk1,pk2), UNIQUE (x) ); CREATE TABLE bar ( fk integer NOT NULL REFERENCES foo (x) );
If these examples don't help, then please post the table definitions
you're working with and explain what you'd like to do.
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/