SQllite add foreign key to existing table [duplicate]

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• Add ON DELETE CASCADE behavior to an sqlite3 table after it has been created 1 answer

I need to add foreign key for my sqllite table. How can do this? i have table history and now i need to add foreign key crypto_data_id in it.

here is my request:

ALTER TABLE History ADD CONSTRAINT crypto_id_data FOREIGN KEY(crypto_data_id) REFERENCES CryptoData(_id) DEFAULT NULL;

Why it doesnt work?