set max_threads = 1; drop table if exists enums; create table enums ( d Date default '2015-12-29', k default 0, e Enum8('world' = 2, 'hello' = 1), sign Enum8('minus' = -1, 'plus' = 1), letter Enum16('a' = 0, 'b' = 1, 'c' = 2, '*' = -256) ) engine = MergeTree(d, k, 1); desc table enums; -- insert default values insert into enums (k) values (0); select * from enums; alter table enums modify column e Enum8('world' = 2, 'hello' = 1, '!' = 3); desc table enums; insert into enums (e, sign, letter) values ('!', 'plus', 'b'); select * from enums ORDER BY _part; -- expand `e` and `sign` from Enum8 to Enum16 without changing values, change values of `letter` without changing type alter table enums modify column e Enum16('world' = 2, 'hello' = 1, '!' = 3), modify column sign Enum16('minus' = -1, 'plus' = 1), modify column letter Enum16('a' = 0, 'b' = 1, 'c' = 2, 'no letter' = -256); desc table enums; select * from enums ORDER BY _part; alter table enums modify column e Enum8('world' = 2, 'hello' = 1, '!' = 3), modify column sign Enum8('minus' = -1, 'plus' = 1); desc table enums; insert into enums (letter, e) values ('c', 'world'); select * from enums ORDER BY _part; drop table enums; create table enums (e Enum8('a' = 0, 'b' = 1, 'c' = 2, 'd' = 3)) engine = TinyLog; insert into enums values ('d'), ('b'), ('a'), ('c'), ('a'), ('d'); select * from enums; -- ORDER BY select * from enums order by e; select * from enums order by e desc; -- GROUP BY select count(), e from enums group by e; select any(e) from enums; -- IN select * from enums where e in ('a', 'd'); select * from enums where e in (select e from enums); -- DISTINCT select distinct e from enums; -- Comparison select * from enums where e = e; select * from enums where e = 'a' or e = 'd'; select * from enums where e != 'a'; select *, e < 'b' from enums; select *, e > 'b' from enums; -- Conversion select toInt8(e), toInt16(e), toUInt64(e), toString(e), e from enums; drop table if exists enums_copy; create table enums_copy engine = TinyLog as select * from enums; select * from enums_copy; drop table enums_copy; create table enums_copy engine = TinyLog as select * from remote('127.0.0.2', currentDatabase(), enums); select * from remote('127.0.0.2', currentDatabase(), enums_copy); drop table enums_copy; drop table enums;