Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# SVV\$1EXTERNAL\$1COLUMNS
<a name="r_SVV_EXTERNAL_COLUMNS"></a>

Use SVV\$1EXTERNAL\$1COLUMNS to view details for columns in external tables. Use SVV\$1EXTERNAL\$1COLUMNS also for cross-database queries to view details on all columns from the table on unconnected databases that users have access to. 

SVV\$1EXTERNAL\$1COLUMNS is visible to all users. Superusers can see all rows; regular users can see only their own data. For more information, see [Visibility of data in system tables and views](cm_chap_system-tables.md#c_visibility-of-data).

## Table columns
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[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/redshift/latest/dg/r_SVV_EXTERNAL_COLUMNS.html)