Merge branch 'patch-4' of https://github.com/pabechevb/sql-docs into 20211129-external-table

Author: MikeRayMSFT

docs/relational-databases/polybase/polybase-configure-teradata.md

@@ -34,10 +34,11 @@ To query the data from a Teradata data source, you must create external tables t
 The following Transact-SQL commands are used in this section:
 
 - [CREATE DATABASE SCOPED CREDENTIAL (Transact-SQL)](../../t-sql/statements/create-database-scoped-credential-transact-sql.md)
-- [CREATE EXTERNAL DATA SOURCE (Transact-SQL)](../../t-sql/statements/create-external-data-source-transact-sql.md) 
+- [CREATE EXTERNAL DATA SOURCE (Transact-SQL)](../../t-sql/statements/create-external-data-source-transact-sql.md)
+- [CREATE EXTERNAL TABLE (Transact-SQL)](../../t-sql/statements/create-external-table-transact-sql.md)
 - [CREATE STATISTICS (Transact-SQL)](../../t-sql/statements/create-statistics-transact-sql.md)
 
-1. Create a database scoped credential for accessing the MongoDB source.
+1. Create a database scoped credential for accessing the Teradata source.
 
     ```sql
     /*  specify credentials to external data source
@@ -54,14 +55,30 @@ The following Transact-SQL commands are used in this section:
 
     ```sql
     /*  LOCATION: Location string should be of format '<vendor>://<server>[:<port>]'.
-    *  PUSHDOWN: specify whether computation should be pushed down to the source. ON by default.
+    * PUSHDOWN: specify whether computation should be pushed down to the source. ON by default.
     * CONNECTION_OPTIONS: Specify driver location
-    *  CREDENTIAL: the database scoped credential, created above.
+    * CREDENTIAL: the database scoped credential, created above.
     */  
     CREATE EXTERNAL DATA SOURCE external_data_source_name
     WITH (LOCATION = teradata://<server address>[:<port>],
     -- PUSHDOWN = ON | OFF,
-    CREDENTIAL =credential_name);
+    CREDENTIAL = credential_name);
+    ```
+
+1. Create an external table with [CREATE EXTERNAL TABLE](../../t-sql/statements/create-external-table-transact-sql.md).
+
+    ```sql
+    /*
+    * LOCATION: Two-part identifier indicating the database and the table name.
+    * DATA_SOURCE: Data source created above.
+    */
+    CREATE EXTERNAL TABLE [TableC] (
+      [MyKey] INT NOT NULL,
+      [RandomInt] INT NOT NULL,
+      [RandomFloat] DECIMAL(13, 2) NOT NULL)
+    WITH (
+      LOCATION = 'TD_SERVER_DB.TableC',
+      DATA_SOURCE = external_data_source_name)
     ```
 
 1. **Optional:** Create statistics on an external table.