How to add foreign key in sql server [closed]

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I have Types column in my Help Table and I want to add foreign key to the Id column in my HelpType table but not really sure what I'm doing wrong so. If I can get any suggestion or help will be really appreciated.

ALTER TABLE Help
   ADD CONSTRAINT FK_Types FOREIGN KEY (Types)
      REFERENCES maxis_charts.HelpType (Id)
;

来源：https://stackoverflow.com/questions/65723540/how-to-add-foreign-key-in-sql-server