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25 lines
453 B
Markdown
25 lines
453 B
Markdown
---
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slug: /en/operations/system-tables/one
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---
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# one
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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.
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This is similar to the `DUAL` table found in other DBMSs.
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**Example**
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```sql
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:) SELECT * FROM system.one LIMIT 10;
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```
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```text
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┌─dummy─┐
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│ 0 │
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└───────┘
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1 rows in set. Elapsed: 0.001 sec.
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```
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