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SET FOREIGN_KEY_CHECKS = 0;

ALTER TABLE Orders
ADD CONSTRAINT FK_PersonOrder
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);

SET FOREIGN_KEY_CHECKS = 1;

-- https://www.w3schools.com/sql/sql_foreignkey.asp
-- https://stackoverflow.com/questions/5005388/cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails