mysql circular dependency in foreign key constraints

Posted by Flavius on Stack Overflow See other posts from Stack Overflow or by Flavius
Published on 2012-09-29T11:03:26Z Indexed on 2012/10/01 9:38 UTC
Read the original article Hit count: 262

Filed under:

mysql

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sql

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database-design

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referential-integrity

Given the schema:

enter image description here

What I need is having every user_identities.belongs_to reference an users.id.

At the same time, every users has a primary_identity as shown in the picture.

However when I try to add this reference with ON DELETE NO ACTION ON UPDATE NO ACTION, MySQL says

#1452 - Cannot add or update a child row: a foreign key constraint fails (yap.#sql-a3b_1bf, CONSTRAINT #sql-a3b_1bf_ibfk_1 FOREIGN KEY (belongs_to) REFERENCES users (id) ON DELETE NO ACTION ON UPDATE NO ACTION)

I suspect this is due to the circular dependency, but how could I solve it (and maintain referential integrity)?

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