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Applies to: ✅ Azure Data Explorer
Alters an existing external table mapping. For more information, see Data mappings.
.alter external table ExternalTableName mapping MappingName MappingInJsonFormat
Learn more about syntax conventions.
| Name | Type | Required | Description |
|---|---|---|---|
| ExternalTableName | The name of the external table to which to assign the mapping. | ||
| MappingName | The name of the mapping. | ||
| MappingInJsonFormat | The mapping definition in JSON format. |
Returns a table containing the mapping name, mapping kind, and new mapping definition.
.alter external table MyExternalTable mapping "Mapping1" '[{"Column": "rownumber", "Properties": {"Path": "$.rownumber"}}, {"Column": "rowguid", "Properties": {"Path": "$.rowguid"}}]'
Output
| Name | Kind | Mapping |
|---|---|---|
| mapping1 | JSON | [{"ColumnName":"rownumber","Properties":{"Path":"$.rownumber"}},{"ColumnName":"rowguid","Properties":{"Path":"$.rowguid"}}] |