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What does a null value in DBMS represent?
Is it unassigned or inapplicable or zero or blank space?
Null is a special marker used in SQL to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL Null serves to fulfill the requirement that all true RDBMS support a representation of missing information and/or inapplicable information
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