mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 05:32:52 +00:00
24 lines
523 B
Markdown
24 lines
523 B
Markdown
# system.one {#system-one}
|
||
|
||
This table contains a single row with a single `dummy` UInt8 column containing the value 0.
|
||
|
||
This table is used if a `SELECT` query doesn’t specify the `FROM` clause.
|
||
|
||
This is similar to the `DUAL` table found in other DBMSs.
|
||
|
||
**Example**
|
||
|
||
```sql
|
||
:) SELECT * FROM system.one LIMIT 10;
|
||
```
|
||
|
||
```text
|
||
┌─dummy─┐
|
||
│ 0 │
|
||
└───────┘
|
||
|
||
1 rows in set. Elapsed: 0.001 sec.
|
||
```
|
||
|
||
[Original article](https://clickhouse.tech/docs/en/operations/system_tables/one) <!--hide-->
|