Mysql modify foreign key

-- 2 Step process
ALTER TABLE tbl_name_1 DROP FOREIGN KEY fk_name;
ALTER TABLE tbl_name_1 ADD FOREIGN KEY fk_name(fk_col)
            REFERENCES tbl_name_2(pk_name) ON DELETE RESTRICT;


-- Use to find the name of the FOREIGN KEY 
SHOW CREATE TABLE tbl_name;

Source: stackoverflow.com

Mysql alter add foreign key

ALTER TABLE ordenes ADD ticket VARCHAR(50) NOT NULL;
ALTER TABLE ordenes ADD CONSTRAINT fk_ticket FOREIGN KEY (ticket) REFERENCES tickets(ticket);

Source: es.stackoverflow.com

Update foreign key value in mysql

SET foreign_key_checks = 0;
UPDATE languages SET id='xyz' WHERE id='abc';
UPDATE categories_languages SET language_id='xyz' WHERE language_id='abc';
SET foreign_key_checks = 1;

Source: stackoverflow.com

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