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QWhich of the following is not true with primary key constraint?

ID: #2786 Relational Model in DBMS 3,137 views
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#2786Q ID
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Relational Model in DBMSTopic
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  • A Primary key attribute cannot have null value. ✔ ✖
  • B Primary key constraint enforces entity integrity. ✔ ✖
  • C Unique key constraint is preferable over primary key constraint. ✔ ✖
  • D Multiple primary key constraints can be defined on a relation. ✔ ✖
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Multiple primary key constraints can be defined on a relation.
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