What is the purpose of the NOT NULL constraint in DB2?

  • NOT NULL constraint allows specifying a default value for a column when NULL is encountered.
  • NOT NULL constraint automatically increments the column value when a new row is inserted.
  • NOT NULL constraint ensures that a column cannot contain NULL values.
  • NOT NULL constraint restricts the insertion of duplicate values in a column.
The NOT NULL constraint in DB2 ensures that a column cannot have NULL values, thereby enforcing data integrity and preventing unexpected behavior in applications that rely on non-null values for certain attributes. This constraint is essential for maintaining data consistency and avoiding errors related to NULL handling. 
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