Web Reference: May 4, 2020 · Until here it works ok, but here is the main problem. query = 'ALTER TABLE purchase ADD foreign key(name) references product (name)' the error code is 1215, so can't add foreign keys. It works if i do this. query = ('ALTER TABLE purchase ADD foreign key(prod_id) references product(prod_id)') The SQL FOREIGN KEY constraint is used to link two tables together. This command is essential for maintaining referential integrity by ensuring that the values in one table correspond to values in another table. The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.
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