Merge branch 'main' of https://github.com/MicrosoftDocs/azure-docs-pr into rolyon-mto-metadata-subservice-remove

Author: rolyon

articles/hdinsight/hdinsight-phoenix-in-hdinsight.md

@@ -41,10 +41,10 @@ For example, here is a physical table named `product_metrics` with the following
 
 ```sql
 CREATE  TABLE product_metrics (
-    metric_type CHAR(1),
+    metric_type CHAR(1)  NOT NULL,
     created_by VARCHAR,
-    created_date DATE,
-    metric_id INTEGER
+    created_date DATE  NOT NULL,
+    metric_id INTEGER  NOT NULL
     CONSTRAINT pk PRIMARY KEY (metric_type, created_by, created_date, metric_id));
 ```