mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-30 11:32:03 +00:00
25 lines
454 B
Markdown
25 lines
454 B
Markdown
---
|
|
slug: /en/operations/system-tables/one
|
|
---
|
|
# 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;
|
|
```
|
|
|
|
```response
|
|
┌─dummy─┐
|
|
│ 0 │
|
|
└───────┘
|
|
|
|
1 rows in set. Elapsed: 0.001 sec.
|
|
```
|