Update define-alternate-keys-entity.md

Author: KumarVivek

powerapps-docs/developer/common-data-service/define-alternate-keys-entity.md

@@ -2,7 +2,7 @@
 title: "Work with alternate keys (Common Data Service) | Microsoft Docs" # Intent and product brand in a unique string of 43-59 chars including spaces
 description: "The topic explains about how to create alternate keys for an entity. Alternate keys can be created programmatically or by using the customization tools" # 115-145 characters including spaces. This abstract displays in the search result.
 ms.custom: ""
-ms.date: 10/31/2018
+ms.date: 06/04/2019
 ms.reviewer: ""
 ms.service: powerapps
 ms.topic: "article"
@@ -39,6 +39,9 @@ You should be aware of the following constraints when creating alternate keys:
   | DecimalAttributeMetadata |   Decimal Number    |
   | IntegerAttributeMetadata |    Whole Number     |
   | StringAttributeMetadata  | Single line of text |
+  | DateTimeAttributeMetadata   |      Date Time    |
+  | LookupAttributeMetadata     |       Lookup        |
+  | PicklistAttributeMetadata   |      Picklist       |
 
 
 - **Valid key size**  
@@ -85,4 +88,4 @@ If the alternate key is deleted while an index creation job is still pending or
  [Using alternate keys](use-alternate-key-create-record.md)<br />
  [Use change tracking to synchronize data with external systems](use-change-tracking-synchronize-data-external-systems.md)<br />
  [Use Upsert to insert or update a record](use-upsert-insert-update-record.md)
- [Define alternate keys to reference records](../../maker/common-data-service/define-alternate-keys-reference-records.md)
+ [Define alternate keys to reference records](../../maker/common-data-service/define-alternate-keys-reference-records.md)