ClickHouse ® tips #10: Null behavior with LowCardinality columns

Inserting a NULL value into a LowCardinality(String) column in a database will result in it being stored as an empty string, demonstrating how the system internally handles such inputs. By using LowCardinality(Nullable(String)) as opposed to just Nullable(String), not only can one achieve the benefits associated with LowCardinality when the conditions are favorable, but it also enables ordering by that column. This illustrates the flexibility and advantages of using LowCardinality(Nullable(String)) in certain database operations.