When trying to ALTER TABLE in Postgres 9.5 to create foreign key constraint: from product_template.product_brand_id
to product_brand.id
ALTER TABLE public.product_template
ADD CONSTRAINT product_template_product_brand_id_fkey
FOREIGN KEY (product_brand_id)
REFERENCES public.product_brand (id) MATCH SIMPLE
ON UPDATE NO ACTION
ON DELETE SET NULL;
Returns error
ERROR: insert or update on table "product_template" violates foreign key constraint "product_template_product_brand_id_fkey"
DETAIL: Key (product_brand_id)=(12) is not present in table "product_brand".
STATEMENT: ALTER TABLE "product_template" ADD FOREIGN KEY ("product_brand_id") REFERENCES "product_brand" ON DELETE set null
Im confused why postgres is trying to find product_brand.product_brand_id
, when the fkey is from product_template.product_brand_id
to product_brand.id
Any ideas?
The error message simply states that there is at least one row in the table product_template
that contains the value 12
in the column product_brand_id
But there is no corresponding row in the table product_brand
where the column id
contains the value 12
Key (product_brand_id)=(12)
relates the source column of the foreign key, not the target column.
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