# NOT NULL characteristic

The SQL standard says NOT NULL is a constraint, and can be named and viewed in the information schema as such. Derby does not provide naming for NOT NULL, nor does it present it as a constraint in the information schema, only as a characteristic of the column.

Parent topic: Derby and standards
Related concepts
Dynamic SQL
Cursors
Information schema
Transactions
Stored routines and PSM
Calling functions and procedures
Unique constraints and nulls
DECIMAL max precision
CLOB and BLOB
Expressions on LONGs
ALTER TABLE