Clickhouse创建不排序的无主键的MergeTree表tuple的使用

Clickhouse 的MergeTree引擎，要求必须提供order by 或者 primary key, 否则表创建失败。但Clickhouse提供了 tuple功能，可以不指定排序列。

语法

ORDER BY tuple()

样例

CREATE TABLE t_no_order
(
CREATE TABLE t_tuple
(
    `id` int,
    `name` varchar(100)
)
ENGINE = MergeTree
ORDER BY tuple()

向无排序列的表插入数据

localhost :) insert into t_tuple select * from t2 where id is not null;

INSERT INTO t_tuple SELECT *
FROM t2
WHERE isNotNull(id)

Query id: c369acda-5452-4ec1-93dc-07f6ca4ac109

Ok.

0 rows in set. Elapsed: 0.005 sec.

localhost :) select * from t_tuple;

SELECT *
FROM t_tuple

Query id: 067c6500-e45f-484d-8c74-5b30060fce7c

┌─id─┬─name─┐
│  1 │ 111  │
│  1 │ 111  │
│  2 │ 2222 │
└────┴──────┘

3 rows in set. Elapsed: 0.002 sec.