What is SQL Server internal parallel query partitioning strategy (hash, range, round robin)?

SQL Server distributes parallel work using partitioning strategies like hash, round robin, and range distribution.

During parallel execution, SQL Server distributes rows among worker threads using different strategies. Round robin distributes evenly but ignores data locality. Hash partitioning ensures same keys go to same thread, improving aggregation efficiency. Range partitioning is used when ordered processing is required. Poor partitioning leads to skew and uneven CPU utilization.