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Notes: Foreign keys in MySQL automatically create an index on the table. In this example index fk_books_author_id will be created at column books.author_id.; Setting FOREIGN_KEY_CHECKS disables ...

CREATE TABLE folders ( id INT NOT NULL DEFAULT 0, name VARCHAR(255), parentid INT, PRIMARY KEY (id), FOREIGN KEY (parentid) REFERENCES folders(id) ON DELETE CASCADE ) ENGINE=InnoDB; More options ...