Deprecated -Subject Database Management System › Data Constraints and Integrity - MySQL › Question #15509
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QWhich type of data constraint in MySQL ensures that a column can have a NULL value or a unique non-NULL value?

ID: #15509 Data Constraints and Integrity - MySQL 111 views
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#15509Q ID
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Data Constraints and Integrity - MySQLTopic
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  • A PRIMARY KEY ✔ ✖
  • B UNIQUE ✔ ✖
  • C FOREIGN KEY ✔ ✖
  • D INDEX ✔ ✖
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Explanation

The PRIMARY KEY constraint in MySQL ensures that a column can have a NULL value or a unique non-NULL value. It allows the uniqueness of values and the presence of NULL as a valid option.

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