DOMAINCONSTRAINTS 
The system table DOMAIN.DOMAINCONSTRAINTS describes domains and their definitions.
Structure
OWNER |
CHAR(32) |
Name of the owner of the domain |
DOMAINNAME |
CHAR(32) |
Name of the domain |
CONSTRAINTNAME |
CHAR(32) |
Name of the CONSTRAINT definition |
DEFINITION |
CLOB |
Text of the CONSTRAINT definition |
More Information
Evaluating System Tables, DOMAINCONSTRAINTS
SQL Reference Manual, CONSTRAINT Definition (constraint_definition)