- **Description**: Removes duplicate rows from the result set. - **Performance**: Removes duplicates, can be expensive. - **Factors**: Dataset size. - **Cost**: `cpu_tuple_cost * number of tuples` - ![[ex_unique.png|400]] - ![[ex_unique.svg|150x150]] - **Operates on**: [[Result Set]] - **Workloads**: - [[LWLock]] - [[BufferContent]]