In the variable-length record format, the existence of a null bitmap is utilised to signal whether or not an attribute has a null value. This may be done both explicitly and implicitly. In this particular scenario, the value of the field would be null; hence, the offset and length fields of variable-length fields would have the value null.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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In the variable-length record format, the existence of a null bitmap is utilised to signal whether or not an attribute has a null value. This may be done both explicitly and implicitly. In this particular scenario, the value of the field would be null; hence, the offset and length fields of variable-length fields would have the value null.

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