The ALTER TABLE statement conflicted with the FOREIGN KEY constraint sql

Question

I have this code that creates a foreign key to the table P that has to reference to table Ss. At the moment the column that I want to be a fk is bigint, not null and its default is to 0. Is this the impediment? And the StoredFile column id is not null and is filled with bigint data.

alter table P add constraint fk_fileId_p foreign key (fileID)
    references Ss(id)

Answer 1

为了添加FK，必须确保表StoredFile中存在storefileID 0（例如，通过添加虚拟记录）-否则FK验证将失败并且无法创建约束。