format TabSeparated CSV Values JSONEachRow JSONCompactEachRow INSERT INTO function file(data.{format}) SELECT WatchID, Title, EventTime, RefererCategories, RefererRegions FROM test.hits LIMIT 25000 SETTINGS engine_file_truncate_on_insert=1 DESC file(data.{format}) SETTINGS schema_inference_use_cache_for_file=0 INSERT INTO FUNCTION file(data.{format}) SELECT * FROM numbers(0) SETTINGS engine_file_truncate_on_insert=1