SQL Guide : Database system tables and system views : System tables : SYS_CHECKSTRINGS
  
SYS_CHECKSTRINGS
The SYS_CHECKSTRINGS lists CHECK constraints of the tables.
Column name
Data type
Description
ID
INTEGER
Table identifier referring to SYS_TABLES.
CONSTRAINT_NAME
WVARCHAR
Name of the CHECK constraint (unique for the table) or an empty string for unnamed constraints (one string for all unnamed CHECK constraints. They are AND- concatenated).
CONSTRAINT
WVARCHAR
The constraint string itself. It is checked by the SQL interpreter while performing inserts/updates to the given table.
See also
System tables