Multiple choice

In SQL, NULL values

  1. May throw NullPointerExceptions

  2. Have undefined behavior in logical expressions

  3. Represent the lack of a value for a column

  4. Are only valid in columns with the NULLABLE constraint

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C Correct answer
Explanation

In SQL, NULL is a special marker used to indicate that a data value does not exist in the database. It represents missing, unknown, or inapplicable data, rather than a zero or an empty string.

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