- **Description**: Performs set operations like UNION, INTERSECT, EXCEPT. - **Performance**: Depends on set operation (UNION, INTERSECT, EXCEPT). - **Factors**: Size of input datasets, operation type. - **Cost**: `set operation cost * number of rows` - ![[ex_setop.svg|200x200]]![[ex_hash_setop_except.svg|200]]![[ex_hash_setop_intersect.svg|200]] - **Operates on**: [[Result Set]]