.show external table schema command
Applies to: ✅ Azure Data Explorer
Returns the schema of the external table, as JSON or CSL.
This command is relevant to any external table of any type. For an overview of external tables, see external tables.
Permissions
You must have at least Database User, Database Viewer, or Database Monitor, or External Table Admin permissions to run this command. For more information, see role-based access control.
Syntax
.show external table TableName schema as (json | csl)
.show external table TableName cslschema
Learn more about syntax conventions.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| TableName | string |
✔️ | The name of the table for which to show the schema. |
Returns
| Output parameter | Type | Description |
|---|---|---|
| TableName | string |
Name of external table |
| Schema | string |
The table schema in a JSON format |
| DatabaseName | string |
Table's database name |
| Folder | string |
Table's folder |
| DocString | string |
String documenting the table |
Examples
.show external table T schema as json
.show external table T schema as csl
.show external table T cslschema
Example output
json:
| TableName | Schema | DatabaseName | Folder | DocString |
|---|---|---|---|---|
| T | {"Name":"ExternalBlob", "Folder":"ExternalTables", "DocString":"Docs", "OrderedColumns":[{"Name":"x","Type":"System.Int64","CslType":"long","DocString":""},{"Name":"s","Type":"System.String","CslType":"string","DocString":""}]} |
DB | ExternalTables | Docs |
csl:
| TableName | Schema | DatabaseName | Folder | DocString |
|---|---|---|---|---|
| T | x:long,s:string | DB | ExternalTables | Docs |