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1
Create a database scoped CREDENTIAL for connecting to the SQL Server. It should map IDENTITY and SECRET to your database’s Username and Password respectively. Follow the example below.
CREATE DATABASE SCOPED CREDENTIAL SqlServerCredentials
 WITH IDENTITY = 'yourusername', SECRET = 'yourpassword';
2
Using CREATE EXTERNAL DATASOURCE, create an external datasource that names the instance, identifies the external data source, and sets whether computation should be pushed via PUSHDOWN to source by default. This uses the CREDENTIAL created above. Use the below example as a template.
CREATE EXTERNAL DATA SOURCE SQLServerInstance
 WITH ( LOCATION = 'sqlserver://tds.cdata.com:14333',
 PUSHDOWN = ON,
 CREDENTIAL = SQLServerCredentials);
3
Create the external table using CREATE EXTERNAL TABLE. The statement needs collation and the location must be in three-part notation <database>.<schema>.<table>. See below for a functional example.
CREATE EXTERNAL TABLE DatabasesExternal (
     name VARCHAR(128) COLLATE SQL_Latin1_General_CP1_CI_AS)
   WITH (LOCATION = 'QuickBooksOnline1.QuickBooksOnline.Accounts',
   DATA_SOURCE = SQLServerInstance);
4
For optimal query performance, you can create statistics on external table columns, as per the code example below.
CREATE STATISTICS statistics_name ON customer (C_CUSTKEY)
 WITH FULLSCAN;