mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-05 15:21:43 +00:00
81 lines
2.3 KiB
SQL
81 lines
2.3 KiB
SQL
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;
|