Sql

ALTER TABLE Employee
ADD FOREIGN KEY (DeptNo) REFERENCES Department(DeptNo);

ALTER TABLE 'table_name'
ADD CONSTRAINT 'constraint_name' FOREIGN KEY 'foreign_key' REFERENCES 'column_name'('primary_key');

ALTER TABLE message ADD FOREIGN KEY (sender) REFERENCES users;

ALTER TABLE message ADD FOREIGN KEY (sender) REFERENCES users;

ALTER TABLE message ADD FOREIGN KEY (sender) REFERENCES users;

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