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