add preview and difference section

Author: Clare Zheng (Shanghai Wicresoft Co Ltd)

articles/data-factory/connector-teradata.md

@@ -43,8 +43,7 @@ Specifically, this Teradata connector supports:
 
 ### For version 2.0
 
-If you use the self-hosted integration runtime for the connector version 2.0, you need to [install .NET Data Provider](https://downloads.teradata.com/download/connectivity/net-data-provider-teradata) with version 20.00.03.00 or above on your self-hosted integration runtime. 
-
+ You need to [install .NET Data Provider](https://downloads.teradata.com/download/connectivity/net-data-provider-teradata) with version 20.00.03.00 or above on your self-hosted integration runtime if you use it.
 ### For version 1.0
 
 If you use Self-hosted Integration Runtime, note it provides a built-in Teradata driver starting from version 3.18. You don't need to manually install any driver. The driver requires "Visual C++ Redistributable 2012 Update 4" on the self-hosted integration runtime machine. If you don't yet have it installed, download it from [here](https://www.microsoft.com/en-sg/download/details.aspx?id=30679).
@@ -83,10 +82,10 @@ The following sections provide details about properties that are used to define
 
 The Teradata connector now supports version 2.0. Refer to this [section](#upgrade-the-teradata-connector) to upgrade your Teradata connector version from version 1.0. For the property details, see the corresponding sections.
 
-- [Version 2.0](#version-20)
+- [Version 2.0 (preview)](#version-20-preview)
 - [Version 1.0](#version-10)
 
-### Version 2.0
+### Version 2.0 (preview)
 
 The Teradata linked service supports the following properties when apply version 2.0:
 
@@ -400,8 +399,8 @@ When you copy data from Teradata, the following mappings apply from Teradata's d
 | ByteInt | Int16 | Int16 | 
 | Char | String | String | 
 | Clob | String | String | 
-| Date | Date (converted from DateTime) | DateTime | 
-| Decimal | IBigDecimal (converted from TdDecimal)   | Decimal | 
+| Date | Date | DateTime | 
+| Decimal |  Decimal   | Decimal | 
 | Double | Double | Double | 
 | Graphic | String | Not supported. Apply explicit cast in source query. | 
 | Integer | Int32 | Int32 | 
@@ -425,7 +424,7 @@ When you copy data from Teradata, the following mappings apply from Teradata's d
 | Period (Timestamp) | String | Not supported. Apply explicit cast in source query. | 
 | Period (Timestamp With Time Zone) | String | Not supported. Apply explicit cast in source query. | 
 | SmallInt | Int16 | Int16 | 
-| Time | TimeSpan | TimeSpan | 
+| Time | Time | TimeSpan | 
 | Time With Time Zone | String   | TimeSpan | 
 | Timestamp | DateTime | DateTime | 
 | Timestamp With Time Zone | DateTimeOffset | DateTime | 
@@ -443,9 +442,18 @@ To learn details about the properties, check [Lookup activity](control-flow-look
 
 Here are steps that help you upgrade the Teradata connector:
 
-1. In **Edit linked service** page, select **2.0 (Preview)** under **Version** and configure the linked service by referring to [linked service version 2.0 properties](#version-20).
+1. In **Edit linked service** page, select 2.0 version and configure the linked service by referring to [linked service version 2.0 (preview) properties](#version-20-preview).
+
+2. The data type mapping for the Teradata linked service version 2.0 (preview) is different from that for the version 1.0. To learn the latest data type mapping, see [Data type mapping for Teradata](#data-type-mapping-for-teradata).
+
+
+## Differences between Teradata connector version 2.0 (preview) and version 1.0
+
+The Teradata connector version 2.0 (preview) offers new functionalities and is compatible with most features of version 1.0. The following table shows the feature differences between version 2.0 (preview) and version 1.0.
 
-2. The data type mapping for the Teradata linked service version 2.0 is different from that for the version 1.0. To learn the latest data type mapping, see [Data type mapping for Teradata](#data-type-mapping-for-teradata).
+| Version 2.0 (preview)  | Version 1.0 | 
+| :----------- | :------- |
+| The following mappings are used from Teradata data types to interim service data type.<br><br>Date -> Date<br>Time With Time Zone -> String <br>Timestamp With Time Zone -> DateTimeOffset <br>Graphic -> String<br>Interval Day  -> TimeSpan<br>Interval Day To Hour -> TimeSpan<br>Interval Day To Minute -> TimeSpan<br>Interval Day To Second -> TimeSpan<br>Interval Hour -> TimeSpan<br>Interval Hour To Minute -> TimeSpan<br>Interval Hour To Second -> TimeSpan<br>Interval Minute -> TimeSpan<br>Interval Minute To Second -> TimeSpan<br>Interval Month -> String<br>Interval Second -> TimeSpan<br>Interval Year -> String<br>Interval Year To Month -> String<br>Number -> Double<br>Period (Date) -> String<br>Period (Time) -> String<br>Period (Time With Time Zone) -> String<br>Period (Timestamp) -> String<br>Period (Timestamp With Time Zone) -> String<br>VarGraphic -> String<br>Xml -> String | The following mappings are used from Teradata data types to interim service data type.<br><br>Date -> DateTime<br>Time With Time Zone ->  TimeSpan    <br>Timestamp With Time Zone -> DateTime <br>Other mappings supported by version 2.0 (preview) are not supported by version 1.0. Please apply an explicit cast in the source query.   |  
 
 
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