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62 lines
1.8 KiB
Markdown
62 lines
1.8 KiB
Markdown
---
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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toc_priority: 46
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toc_title: GenerateRandom
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---
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# Generaterandom {#table_engines-generate}
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Le moteur de table GenerateRandom produit des données aléatoires pour un schéma de table donné.
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Exemples d'utilisation:
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- Utiliser dans le test pour remplir une grande table reproductible.
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- Générer une entrée aléatoire pour les tests de fuzzing.
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## Utilisation dans le serveur ClickHouse {#usage-in-clickhouse-server}
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``` sql
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ENGINE = GenerateRandom(random_seed, max_string_length, max_array_length)
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```
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Le `max_array_length` et `max_string_length` les paramètres spécifient la longueur maximale de tous
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colonnes et chaînes de tableau en conséquence dans les données générées.
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Générer le moteur de table prend en charge uniquement `SELECT` requête.
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Il prend en charge tous les [Les types de données](../../../sql-reference/data-types/index.md) cela peut être stocké dans une table sauf `LowCardinality` et `AggregateFunction`.
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**Exemple:**
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**1.** Configurer le `generate_engine_table` table:
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``` sql
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CREATE TABLE generate_engine_table (name String, value UInt32) ENGINE = GenerateRandom(1, 5, 3)
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```
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**2.** Interroger les données:
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``` sql
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SELECT * FROM generate_engine_table LIMIT 3
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```
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``` text
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┌─name─┬──────value─┐
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│ c4xJ │ 1412771199 │
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│ r │ 1791099446 │
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│ 7#$ │ 124312908 │
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└──────┴────────────┘
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```
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## Les détails de mise en Œuvre {#details-of-implementation}
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- Pas pris en charge:
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- `ALTER`
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- `SELECT ... SAMPLE`
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- `INSERT`
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- Index
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- Réplication
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[Article Original](https://clickhouse.tech/docs/en/operations/table_engines/generate/) <!--hide-->
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