mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-02 04:22:03 +00:00
24 lines
499 B
Markdown
24 lines
499 B
Markdown
# 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 does not 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.com/docs/en/operations/system-tables/one) <!--hide-->
|