Mac Mac - 8 months ago 55
SQL Question

can we have a foreign key which is not a primary key in any other table?

it is written in every book that foreign keys are actually primary key in some other table but can we have a foreign key which is not primary key in any other table

Answer Source

Yes - you can have a foreign key that references a unique index in another table.

CREATE UNIQUE INDEX UX01_YourTable ON dbo.YourTable(SomeUniqueColumn)

ALTER TABLE dbo.YourChildTable
   ADD CONSTRAINT FK_ChildTable_Table
   FOREIGN KEY(YourFKColumn) REFERENCES dbo.YourTable(SomeUniqueColumn)
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