Can DB2 Indexed Fields Be Empty?

In the DB2 database, it is possible for the values of indexed fields to be empty. Whether the values of indexed fields can be empty depends on the index’s definition. When creating an index, it is possible to specify whether empty values are allowed. If the indexed fields allow empty values, then empty values can be inserted when creating the index.

If it is required for a indexed field to not allow empty values, then you can set a NOT NULL constraint when creating the index to ensure the field is not empty. Trying to insert an empty value into the indexed field will result in a constraint violation error.

In general, the DB2 index field can be empty, but whether or not null values are allowed depends on the definition of the index.