DROP TABLE IF EXISTS mt_00168; DROP TABLE IF EXISTS mt_00168_buffer; set allow_deprecated_syntax_for_merge_tree=1; CREATE TABLE mt_00168 (EventDate Date, UTCEventTime DateTime, MoscowEventDate Date DEFAULT toDate(UTCEventTime)) ENGINE = MergeTree(EventDate, UTCEventTime, 8192); CREATE TABLE mt_00168_buffer AS mt_00168 ENGINE = Buffer(currentDatabase(), mt_00168, 16, 10, 100, 10000, 1000000, 10000000, 100000000); DESC TABLE mt_00168; DESC TABLE mt_00168_buffer; INSERT INTO mt_00168 (EventDate, UTCEventTime) VALUES ('2015-06-09', '2015-06-09 01:02:03'); SELECT * FROM mt_00168_buffer; INSERT INTO mt_00168_buffer (EventDate, UTCEventTime) VALUES ('2015-06-09', '2015-06-09 01:02:03'); SELECT * FROM mt_00168_buffer; DROP TABLE mt_00168_buffer; DROP TABLE mt_00168;