PostgreSQL: NULL value in foreign key column
Works for me in 9.3 after correcting a missing comma. I'm sure it will work also in 9.1
create table quotations ( receipt_id bigint not null primary key);create table order_confirmations ( receipt_id bigint not null primary key, fk_quotation_receipt_id bigint references quotations (receipt_id));insert into order_confirmations (receipt_id, fk_quotation_receipt_id) values (1, null);Confirmation will include:
INSERT 0 1