DROP TABLE IF EXISTS cast_enums; set allow_deprecated_syntax_for_merge_tree=1; CREATE TABLE cast_enums ( type Enum8('session' = 1, 'pageview' = 2, 'click' = 3), date Date, id UInt64 ) ENGINE = MergeTree(date, (type, date, id), 8192); INSERT INTO cast_enums SELECT 'session' AS type, toDate('2017-01-01') AS date, number AS id FROM system.numbers LIMIT 2; INSERT INTO cast_enums SELECT 2 AS type, toDate('2017-01-01') AS date, number AS id FROM system.numbers LIMIT 2; SELECT type, date, id FROM cast_enums ORDER BY type, id; INSERT INTO cast_enums VALUES ('wrong_value', '2017-01-02', 7); -- { clientError 691 } DROP TABLE IF EXISTS cast_enums;