ClickHouse/docs/en/operations/system-tables/one.md

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---
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slug: /en/operations/system-tables/one
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---
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# one
This table contains a single row with a single `dummy` UInt8 column containing the value 0.
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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 │
└───────┘
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1 rows in set. Elapsed: 0.001 sec.
```