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QWhich of the following constraints ensures that the foreign key value in the referencing relation must exist in the primary key attribute of the referenced relation?

ID: #2806 Structured Query Language 1,097 views
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#2806Q ID
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  • A Unique Key ✔ ✖
  • B Reference Key ✔ ✖
  • C Foreign key ✔ ✖
  • D Primary key ✔ ✖
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Foreign key
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