| Class | Description | 
|---|---|
| Column | 
 Class representing a column of the database table. 
 | 
| Expression | 
 Abstract base class for all expressions. 
 | 
| Function | 
 Base class for all any sql functions. 
 | 
| NextVal | 
 Class for NEXTVAL sql function. 
 | 
| Parameter | 
 A parameter in a SQL query. 
 | 
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