See: Description
| Interface | Description | 
|---|---|
| UniqueDelegate | 
 Dialect-level delegate in charge of applying "uniqueness" to a column. 
 | 
| Class | Description | 
|---|---|
| DB2UniqueDelegate | 
 DB2 does not allow unique constraints on nullable columns. 
 | 
| DefaultUniqueDelegate | 
 The default UniqueDelegate implementation for most dialects. 
 | 
| InformixUniqueDelegate | 
 Informix requires the constraint name to come last on the alter table. 
 | 
| MySQLUniqueDelegate | 
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