See: Description
| Class | Description | 
|---|---|
| SqlCheckConstraint | 
 Parse tree for  
UNIQUE, PRIMARY KEY constraints. | 
| SqlColumnDeclaration | 
 Parse tree for column. 
 | 
| SqlCreateExternalTable | 
 Parse tree for  
CREATE EXTERNAL TABLE statement. | 
| SqlDdlNodes | 
 Utilities concerning  
SqlNode for DDL. | 
| SqlDropTable | 
 Parse tree for  
DROP TABLE statement. | 
| SqlSetOptionBeam | 
 SQL parse tree node to represent  
SET and RESET statements. |