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Copy file name to clipboardExpand all lines: data-explorer/create-table-wizard.md
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description: Learn how to easily create a table and manually define the schema in Azure Data Explorer with the table creation wizard.
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ms.reviewer: aksdi
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ms.topic: how-to
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ms.date: 02/02/2026
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ms.date: 02/12/2026
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# Customer intent: As a data engineer, I want to create an empty table in Azure Data Explorer so that I can ingest data and query it.
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---
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# Create a table in Azure Data Explorer
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Creating a table is an important step in the process of [data ingestion](ingest-data-overview.md) and [query](/azure/data-explorer/kusto/query/tutorials/learn-common-operators) in Azure Data Explorer. The following article shows how to create a table and schema mapping quickly and easily by using the Azure Data Explorer web UI.
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Creating a table is an important step in the process of [data ingestion](ingest-data-overview.md) and [querying](/azure/data-explorer/kusto/query/tutorials/learn-common-operators) in Azure Data Explorer. The following article shows how to create a table and schema mapping quickly and easily by using the Azure Data Explorer web UI.
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> [!NOTE]
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> To create a new table based on existing data, see [Get data from file](get-data-file.md) or [Get data from Azure storage](get-data-storage.md).
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## Schema tab
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1. Select **Add new column**. The **Edit columns** panel opens.
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1. Select **Add new column** to open the **Edit columns** panel.
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1. For each column, enter **Column name** and **Data type**. Create more columns by selecting **Add column**.
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:::image type="content" source="media/create-table-wizard/edit-columns.png" alt-text="Screenshot of Edit columns pane, in which you input the column name and data type in Azure Data Explorer.":::
Copy file name to clipboardExpand all lines: data-explorer/external-table.md
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---
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title: Create an external table using the Azure Data Explorer web UI wizard in Azure Data Explorer
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title: Create an External Table Using the Azure Data Explorer Web UI Wizard in Azure Data Explorer
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description: Use the wizard experience to create an external table.
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ms.reviewer: ohbitton
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ms.topic: how-to
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ms.date: 08/25/2022
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ms.date: 02/12/2026
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---
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# Create an external table using the Azure Data Explorer web UI wizard
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### Destination tab
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1. The **Cluster** and **Database** fields are prepopulated. You may select a different destination from the dropdown menu.
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1. The **Cluster** and **Database** fields are prepopulated. You can select a different destination from the dropdown menu.
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1. In **Table name**, enter a name for your table.
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> [!TIP]
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> Table names can be up to 1024 characters including alphanumeric, hyphens, and underscores. Special characters aren't supported.
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1. Select **Next: Source**
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> Table names can be up to 1,024 characters including alphanumeric, hyphens, and underscores. Special characters aren't supported.
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1. Select **Next: Source**.
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:::image type="content" source="media/external-table/destination-tab.png" alt-text="Screen capture of the Destination tab with Cluster, Database, and Table name fields.":::
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### Source tab
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In **Link to containers**, there are two ways to add a container: [Add a container with the **Select container** button](#add-a-container-with-the-select-container-button) and [Add a container with the **Add URL or Add container** button](#add-a-container-with-the-add-url-or-add-container-button).
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In **Link to containers**, you can add a container in two ways: [Add a container with the **Select container** button](#add-a-container-with-the-select-container-button) and [Add a container with the **Add URL or Add container** button](#add-a-container-with-the-add-url-or-add-container-button).
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You can add up to 10 source containers.
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:::image type="content" source="media/external-table/select-container.png" alt-text="Screenshot of select container button in source tab.":::
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1. Choose the relevant subscription and storage account associated with your container.
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1. Choose the subscription and storage account that your container uses.
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:::image type="content" source="media/select-container-window.png" alt-text="Screenshot of select container window.":::
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1. Select the **Add** button. When verification has completed, a green check will appear to the right of the container link.
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1. Select **Add**. When verification finishes, a green check appears to the right of the container link.
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:::image type="content" source="media/external-table/container-verified.png" alt-text="Screenshot of verified container link.":::
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:::image type="content" source="media/external-table/add-url-button.png" alt-text="Screenshot of add URL button.":::
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1. Enter a [storage connection strings](/kusto/api/connection-strings/storage-connection-strings?view=azure-data-explorer&preserve-view=true) to your source container with read and list permissions. When verification has completed, a green check will appear to the right of the container link.
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1. Enter a [storage connection strings](/kusto/api/connection-strings/storage-connection-strings?view=azure-data-explorer&preserve-view=true) to your source container with read and list permissions. When verification finishes, a green check appears to the right of the container link.
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:::image type="content" source="media/external-table/add-sas-url.png" alt-text="Screenshot of adding SAS URL.":::
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#### File filters
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Use **File filters** to filter the files that the table should include. Files can be filtered according to folder path, file begins with, or file extension.
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Use **File filters** to filter the files that the table should include. You can filter files by folder path, file begins with, or file extension.
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:::image type="content" source="media/external-table/file-filters.png" alt-text="Screenshot of selecting schema-defining file.":::
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#### Schema-defining file
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The first source container will display files below **File filters**.
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The first source container displays files below **File filters**.
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:::image type="content" source="media/external-table/schema-defining-file.png" alt-text="Screen shot of create external table source tab in Azure Data Explorer.":::
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1. Choose the schema-defining file by selecting the circle to the left of the file. This file will be used to generate the table schema.
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1. Choose the schema-defining file by selecting the circle to the left of the file. This file is used to generate the table schema.
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1. Select **Next: schema**. The **Schema** tab opens.
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### Schema tab
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In the right-hand side of the tab, you can preview your data. On the left-hand side, you can add [partitions](/kusto/management/partitioning-policy?view=azure-data-explorer&preserve-view=true) to your table definitions to access the source data more quickly and achieve better performance.
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On the right side of the tab, you can preview your data. On the left side, you can add [partitions](/kusto/management/partitioning-policy?view=azure-data-explorer&preserve-view=true) to your table definitions to access the source data more quickly and achieve better performance.
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> [!NOTE]
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> Mappings are not part of the definition of an external table, and are not supported in this wizard. Mappings can be [configured later](/kusto/management/external-table-mapping-create?view=azure-data-explorer&preserve-view=true) if necessary. Some functionalities, such as deleting the last column in CSV files or changing column names in JSON files, require mappings in order to work correctly.
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> Mappings aren't part of the definition of an external table, and the wizard doesn't support them. You can [configure mappings later](/kusto/management/external-table-mapping-create?view=azure-data-explorer&preserve-view=true) if necessary. Some functionalities, such as deleting the last column in CSV files or changing column names in JSON files, require mappings in order to work correctly.
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1. Select **Add partition**.
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:::image type="content" source="media/external-table/view-file.png" alt-text="Screen shot of view file for external table in Azure Data Explorer.":::
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1. The partition window opens. A partition is defined over a subpath of the file, which can be altered using the **Path prefix** field. For each partition you wish to apply, fill out the fields as follows:
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1. The partition window opens. A partition is defined over a subpath of the file, which you can change by using the **Path prefix** field. For each partition you want to apply, fill out the fields as follows:
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Field | Description | Required/Optional
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Function | The function applied to the data column used for partitioning. | Optional
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Function argument | Argument to be used in the partition function. | Required if function is used.
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Path prefix | The subpath of the file on which the partitioning is defined. This prefix changes the URL of the external table, as seen in the **Uri preview** box, and should match the schema-defining file URI. | Optional
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Datetime pattern | Format of date that will be used to construct the table URI path. | Optional
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Datetime pattern | Format of date that you use to construct the table URI path. | Optional
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:::image type="content" source="media/external-table/add-partitions.png" alt-text="Screen shot add partitions to external table in Azure Data Explorer." lightbox="media/external-table/add-partitions.png":::
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For example, the partition name *CustomerName* suggests that the value to partition by is in the customer name part of the URL. The above example declared two partitions: one partition over the customer name and one partition over the date embedded in the URL.
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For example, the partition name *CustomerName* suggests that the value to partition by is in the customer name part of the URL. The preceding example declares two partitions: one partition over the customer name and one partition over the date embedded in the URL.
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> [!NOTE]
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> Virtual columns appear as part of the schema as the columns data extracted from the file path, and this data can be used later in queries.
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> Virtual columns appear as part of the schema as the columns data extracted from the file path, and you can use this data later in queries.
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1. Select **Add partition** to add another partition.
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1. Select **Save**. The partitions you added now appear in the list of **Partitions** in the left pane. Partitioned columns can't be changed in preview.
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1. Select **Save**. The partitions you added now appear in the list of **Partitions** in the left pane. You can't change partitioned columns in preview.
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:::image type="content" source="media/external-table/schema.png" alt-text="Screenshot of schema external table Azure Data Explorer.":::
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1. Select **Next: Create table**. When the table is created, an **External table successfully created** window opens.
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1. Select **Next: Create table**. When you create the table, an **External table successfully created** window opens.
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1. To view the command used to create the table, select **View command**.
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:::image type="content" source="media/external-table/successfully-created.png" alt-text="Screenshot of successful creation of external table in Azure Data Explorer.":::
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1. To undo the creation of the external table, select **Tools** > **Undo**.
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## Query the external table
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The resulting table includes data from all the files that fit the criteria defined above. You can query this table using the `external_table()` function. For more information on how to query external tables, see [Querying an external table](data-lake-query-data.md#querying-an-external-table).
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The resulting table includes data from all the files that fit the criteria you defined. You can query this table by using the `external_table()` function. For more information on how to query external tables, see [Querying an external table](data-lake-query-data.md#querying-an-external-table).
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:::image type="content" source="media/external-table/view-table.png" alt-text="Screen shot of table output from querying external table in Azure Data Explorer.":::
Copy file name to clipboardExpand all lines: data-explorer/get-data-file.md
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description: Learn how to get data from a local file in Azure Data Explorer.
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ms.reviewer: sharmaanshul
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ms.topic: how-to
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ms.date: 02/08/2026
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ms.date: 02/12/2026
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ms.custom: sfi-image-nochange
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# Get data from file
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Data ingestion is the process of loading data from one or more sources into a table in Azure Data Explorer. Once ingested, the data is available for query. In this article, you learn how to get data from a local file into either a new or existing table.
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