> ## Documentation Index
> Fetch the complete documentation index at: https://docs.startree.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# External Tables

> Iceberg catalogs and raw Parquet queried in place.

Query Iceberg catalogs and raw Parquet in place — no copy, no ETL.

<CardGroup cols={3}>
  <Card title="AWS Glue" icon="aws" href="/corecapabilities/external-table/glue/onboarding-data-portal">
    Connect an AWS Glue Iceberg catalog as an External Table with the Data Portal wizard — no API calls.
  </Card>

  <Card title="Amazon S3 Tables" icon="table" href="/corecapabilities/external-table/s3tables/onboarding-data-portal">
    Connect an Amazon S3 Tables bucket as an External Table with the point-and-click Data Portal wizard.
  </Card>

  <Card title="Unity Catalog" icon="layer-group" href="/corecapabilities/external-table/unity/onboarding-data-portal">
    Connect Databricks or OSS Unity Catalog, including Delta tables with UniForm, via the Data Portal wizard.
  </Card>

  <Card title="Apache Polaris & Snowflake Open Catalog" icon="diagram-project" href="/corecapabilities/external-table/polaris/onboarding-data-portal">
    Connect Polaris or Snowflake Open Catalog Iceberg tables via the wizard using OAuth2 principal credentials.
  </Card>

  <Card title="Snowflake Horizon Catalog" icon="snowflake" href="/corecapabilities/external-table/horizon/onboarding-data-portal">
    Connect Snowflake-managed Iceberg tables (Horizon) via the Data Portal wizard, authenticating with a PAT.
  </Card>

  <Card title="S3 Data Lake" icon="bucket" href="/corecapabilities/external-table/s3/onboarding-data-portal">
    Query raw Parquet files in an S3 bucket as an External Table — no catalog service required.
  </Card>

  <Card title="GCS Data Lake" icon="google" href="/corecapabilities/external-table/gcs/onboarding-data-portal">
    Connect raw Parquet files on GCS via the S3-compatible interop endpoint using the Data Portal wizard.
  </Card>

  <Card title="Support Matrix" icon="table-cells" href="/corecapabilities/external-table/support-matrix">
    See supported catalogs, table and file formats, auth methods, features, indexes, and limits in one place.
  </Card>
</CardGroup>