Format and acrolinx update

Author: whhender

articles/synapse-analytics/sql-data-warehouse/sql-data-warehouse-table-constraints.md

@@ -4,10 +4,10 @@ description: Table constraints support using dedicated SQL pool in Azure Synapse
 author: mstehrani
 ms.author: emtehran
 ms.reviewer: nibruno; wiassaf
-ms.date: 09/05/2019
+ms.date: 02/21/2025
 ms.service: azure-synapse-analytics
 ms.subservice: sql-dw
-ms.topic: conceptual
+ms.topic: concept-article
 ms.custom:
   - azure-synapse
 ---
@@ -19,23 +19,23 @@ Learn about table constraints in dedicated SQL pool, including primary key, fore
 ## Table constraints
 
 Dedicated SQL pool supports these table constraints: 
-- PRIMARY KEY is only supported when NONCLUSTERED and NOT ENFORCED are both used.    
+- PRIMARY KEY is only supported when NONCLUSTERED and NOT ENFORCED are both used.   
 - UNIQUE constraint is only supported when NOT ENFORCED is used.
 
 For syntax, check [ALTER TABLE](/sql/t-sql/statements/alter-table-transact-sql) and [CREATE TABLE](/sql/t-sql/statements/create-table-azure-sql-data-warehouse). 
 
-FOREIGN KEY constraint is not supported in dedicated SQL pool.  
+FOREIGN KEY constraint isn't supported in dedicated SQL pool. 
 
 
 ## Remarks
 
-Having primary key and/or unique key allows dedicated SQL pool engine to generate an optimal execution plan for a query.  All values in a primary key column or a unique constraint column should be unique.
+Having primary key and/or unique key allows dedicated SQL pool engine to generate an optimal execution plan for a query. All values in a primary key column or a unique constraint column should be unique.
 
 > [!IMPORTANT]  
 > After creating a table with primary key or unique constraint in dedicated SQL pool, users need to make sure all values in those columns are unique.
 > A violation of that may cause the query to return inaccurate result. 
 
-This example shows how a query may return inaccurate result if the primary key or unique constraint column includes duplicate values.  
+This example shows how a query may return inaccurate result if the primary key or unique constraint column includes duplicate values. 
 
 ```sql
  -- Create table t1
@@ -48,7 +48,7 @@ INSERT INTO t1 VALUES (2, 200)
 INSERT INTO t1 VALUES (3, 300)
 INSERT INTO t1 VALUES (4, 400)
 
--- Run this query.  No primary key or unique constraint.  4 rows returned. Correct result.
+-- Run this query. No primary key or unique constraint. 4 rows returned. Correct result.
 SELECT a1, COUNT(*) AS total FROM t1 GROUP BY a1
 
 /*
@@ -65,7 +65,7 @@ a1          total
 -- Add unique constraint
 ALTER TABLE t1 ADD CONSTRAINT unique_t1_a1 unique (a1) NOT ENFORCED
 
--- Re-run this query.  5 rows returned.  Incorrect result.
+-- Re-run this query. 5 rows returned. Incorrect result.
 SELECT a1, count(*) AS total FROM t1 GROUP BY a1
 
 /*
@@ -86,7 +86,7 @@ ALTER TABLE t1 DROP CONSTRAINT unique_t1_a1
 -- Add primary key constraint
 ALTER TABLE t1 add CONSTRAINT PK_t1_a1 PRIMARY KEY NONCLUSTERED (a1) NOT ENFORCED
 
--- Re-run this query.  5 rows returned.  Incorrect result.
+-- Re-run this query. 5 rows returned. Incorrect result.
 SELECT a1, COUNT(*) AS total FROM t1 GROUP BY a1
 
 /*
@@ -122,7 +122,7 @@ a1          b1
 -- Add unique constraint
 ALTER TABLE t1 add CONSTRAINT unique_t1_a1 UNIQUE (a1) NOT ENFORCED  
 
--- Re-run this query.  5 rows returned.  Correct result.
+-- Re-run this query. 5 rows returned. Correct result.
 SELECT a1, COUNT(*) as total FROM t1 GROUP BY a1
 
 /*
@@ -143,7 +143,7 @@ ALTER TABLE t1 DROP CONSTRAINT unique_t1_a1
 -- Add primary key constraint
 ALTER TABLE t1 ADD CONSTRAINT PK_t1_a1 PRIMARY KEY NONCLUSTERED (a1) NOT ENFORCED
 
--- Re-run this query.  5 rows returned.  Correct result.
+-- Re-run this query. 5 rows returned. Correct result.
 SELECT a1, COUNT(*) AS total FROM t1 GROUP BY a1
 
 /*
@@ -174,6 +174,6 @@ Create a dedicated SQL pool table with a unique constraint:
 CREATE TABLE t6 (c1 INT UNIQUE NOT ENFORCED, c2 INT);
 ```
 
-## Next steps
+## Related content
 
 After creating the tables for your dedicated SQL pool, the next step is to load data into the table. For a loading tutorial, see [Loading data to dedicated SQL pool](load-data-wideworldimportersdw.md).