> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-mintlify-8c05c8a2.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Documentation sur le format JSONColumns

# JSONColumns

| Entrée | Sortie | Alias |
| ------ | ------ | ----- |
| ✔      | ✔      |       |

<div id="description">
  ## Description
</div>

<Tip>
  La sortie des formats JSONColumns\* affiche le nom du champ ClickHouse, puis le contenu de chaque ligne de la table pour ce champ ;
  visuellement, les données sont tournées de 90 degrés vers la gauche.
</Tip>

Dans ce format, toutes les données sont représentées sous la forme d'un seul objet JSON.

<Note>
  Le format `JSONColumns` met toutes les données en mémoire tampon, puis les restitue sous la forme d'un seul bloc ; cela peut donc entraîner une consommation mémoire élevée.
</Note>

<div id="example-usage">
  ## Exemple d’utilisation
</div>

<div id="inserting-data">
  ### Insérer des données
</div>

À l’aide d’un fichier JSON nommé `football.json` et contenant les données suivantes :

```json theme={null}
{
    "date": ["2022-04-30", "2022-04-30", "2022-04-30", "2022-05-02", "2022-05-02", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07"],
    "season": [2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021],
    "home_team": ["Sutton United", "Swindon Town", "Tranmere Rovers", "Port Vale", "Salford City", "Barrow", "Bradford City", "Bristol Rovers", "Exeter City", "Harrogate Town A.F.C.", "Hartlepool United", "Leyton Orient", "Mansfield Town", "Newport County", "Oldham Athletic", "Stevenage Borough", "Walsall"],
    "away_team": ["Bradford City", "Barrow", "Oldham Athletic", "Newport County", "Mansfield Town", "Northampton Town", "Carlisle United", "Scunthorpe United", "Port Vale", "Sutton United", "Colchester United", "Tranmere Rovers", "Forest Green Rovers", "Rochdale", "Crawley Town", "Salford City", "Swindon Town"],
    "home_team_goals": [1, 2, 2, 1, 2, 1, 2, 7, 0, 0, 0, 0, 2, 0, 3, 4, 0],
    "away_team_goals": [4, 1, 0, 2, 2, 3, 0, 0, 1, 2, 2, 1, 2, 2, 3, 2, 3]
}
```

Insérez les données :

```sql theme={null}
INSERT INTO football FROM INFILE 'football.json' FORMAT JSONColumns;
```

<div id="reading-data">
  ### Lecture des données
</div>

Lisez les données au format `JSONColumns` :

```sql theme={null}
SELECT *
FROM football
FORMAT JSONColumns
```

La sortie sera au format JSON :

```json theme={null}
{
    "date": ["2022-04-30", "2022-04-30", "2022-04-30", "2022-05-02", "2022-05-02", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07", "2022-05-07"],
    "season": [2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021, 2021],
    "home_team": ["Sutton United", "Swindon Town", "Tranmere Rovers", "Port Vale", "Salford City", "Barrow", "Bradford City", "Bristol Rovers", "Exeter City", "Harrogate Town A.F.C.", "Hartlepool United", "Leyton Orient", "Mansfield Town", "Newport County", "Oldham Athletic", "Stevenage Borough", "Walsall"],
    "away_team": ["Bradford City", "Barrow", "Oldham Athletic", "Newport County", "Mansfield Town", "Northampton Town", "Carlisle United", "Scunthorpe United", "Port Vale", "Sutton United", "Colchester United", "Tranmere Rovers", "Forest Green Rovers", "Rochdale", "Crawley Town", "Salford City", "Swindon Town"],
    "home_team_goals": [1, 2, 2, 1, 2, 1, 2, 7, 0, 0, 0, 0, 2, 0, 3, 4, 0],
    "away_team_goals": [4, 1, 0, 2, 2, 3, 0, 0, 1, 2, 2, 1, 2, 2, 3, 2, 3]
}
```

<div id="format-settings">
  ## Paramètres de format
</div>

Lors de l'importation, les colonnes portant des noms inconnus seront ignorées si le paramètre [`input_format_skip_unknown_fields`](/fr/reference/settings/formats#input_format_skip_unknown_fields) est défini sur `1`.
Les colonnes absentes du bloc seront remplies de valeurs par défaut (vous pouvez utiliser ici le paramètre [`input_format_defaults_for_omitted_fields`](/fr/reference/settings/formats#input_format_defaults_for_omitted_fields))