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Distributed SQL Surface Area

SingleStore DB supports a large subset of the SQL surface area, with the following limitations:

  • Reference tables must have explicit primary keys.
  • An AUTO_INCREMENT column in a distributed table must be a BIGINT. Auto-increment values are monotonically increasing on each aggregator but not consecutive across the cluster.
  • Sharded tables do not support unique keys (unless the unique key is a superset of the shard key).
  • Sharded tables do not support UPDATE queries that modify the shard key.
  • Sharded tables do not support UPDATE...LIMIT.