# SYSKEYS system table

Describes the specific information for primary key and unique constraints within the current database. Derby generates an index on the table to back up each such constraint. The index name is the same as SYSKEYS.CONGLOMERATEID.

Column Name | Type | Length | Nullable | Contents
--- | --- | --- | --- | ---
CONSTRAINTID | CHAR | 36 | false | unique identifier for constraint
CONGLOMERATEID | CHAR | 36 | false | unique identifier for backing index

Parent topic: Derby system tables