| Value | Meaning | 
|---|---|
| Equals | Representation of "{} = {}" in SQL | 
| NotEquals | Representation of "{} <> {}" in SQL | 
| Greater | Representation of "{} > {}" in SQL | 
| GreaterOrEquals | Representation of "{} >= {}" in SQL | 
| Less | Representation of "{} < {}" in SQL | 
| LessOrEquals | Representation of "{} <= {}" in SQL | 
| Like | Representation of "{} LIKE {}" in SQL | 
| NotLike | Representation of "{} NOT LIKE {}" in SQL | 
| Regexp | Representation of "{} REGEXP {}" in SQL | 
| NotRegexp | Representation of "{} NOT REGEXP {}" in SQL | 
| In | Representation of "{} IN {}" in SQL | 
| NotIn | Representation of "{} NOT IN {}" in SQL | 
tagged union type