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  1. Purpose of foreign key constraint in SQL Server is :

  1. FOREIGN KEY constraints identify and enforce the relationships between tables
  2. A foreign key in one table points to a candidate key in another table
  3. You cannot insert a row with a foreign key value, except NULL, if there is no candidate key with that value
  4. None of the mentioned

Correct Answer:
A. FOREIGN KEY constraints identify and enforce the relationships between tables

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