On 22/05/2010 17:03, erobles wrote:
> ERROR: there is no unique constraint matching given keys for referenced
> table "table_name'"
>
>
> there is a way to solve this?? what can i do ??
It means you need to have a primary key, or at least a unique
constraint, on the target table which uses the column(s) which the
foreign key references.
For example:
postgres=# create table a(f1 integer, f2 integer);
CREATE TABLE
postgres=# create table b(f3 integer, f4 integer);
CREATE TABLE
postgres=# alter table a add foreign key (f2) references b(f3);
ERROR: there is no unique constraint matching given keys for referenced
table "b"
If I now add a primary key to table b, it works:
postgres=# alter table b add primary key(f3);
NOTICE: ALTER TABLE / ADD PRIMARY KEY will create implicit index
"b_pkey" for table "b"
ALTER TABLE
postgres=# alter table a add foreign key (f2) references b(f3);
ALTER TABLE
HTH.
Ray.
--
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie
