# columnLevelConstraint

    [ CONSTRAINT constraintName ]
    {
        NOT NULL |
        CHECK ( searchCondition ) |
        PRIMARY KEY |
        UNIQUE |
        REFERENCES clause
    } [ constraintCharacteristics ]

A searchCondition is any boolean expression that meets the requirements specified in Requirements for search conditions.

If a constraintName is not specified, Derby generates a unique constraint name.

Parent topic: CONSTRAINT clause
Related reference
tableLevelConstraint
REFERENCES clause
constraintCharacteristics