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Register todayDROP EXTERNAL FILE FORMAT (Transact-SQL)
Applies to: 
SQL Server 2016 (13.x) and later
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Removes a PolyBase external file format.
Transact-SQL syntax conventions
syntaxsql
-- Drop an external file format
DROP EXTERNAL FILE FORMAT external_file_format_name
[;]
external_file_format_name
The name of the external file format to drop.
To view a list of external file formats use the sys.external_file_formats (Transact-SQL) system view.
SQL
SELECT * FROM sys.external_file_formats;
Requires ALTER ANY EXTERNAL FILE FORMAT.
Dropping an external file format does not remove the external data.
Takes a shared lock on the external file format object.
SQL
DROP EXTERNAL FILE FORMAT myfileformat;