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Applies to: 
SQL Server 2016 (13.x) and later versions
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Removes an external data source used for PolyBase and data virtualization features.
Transact-SQL syntax conventions
Syntax
-- Drop an external data source
DROP EXTERNAL DATA SOURCE external_data_source_name
[;]
Arguments
external_data_source_name
The name of the external data source to drop.
Metadata
To view a list of external data sources, use the sys.external_data_sources system view.
SELECT * FROM sys.external_data_sources;
Permissions
Requires ALTER ANY EXTERNAL DATA SOURCE.
Locking
Takes a shared lock on the external data source object.
Remarks
Dropping an external data source does not remove the external data.
Examples
A. Use basic syntax
DROP EXTERNAL DATA SOURCE mydatasource;