Merge pull request #113421 from XiaoyuMSFT/updatablekey

updatable dist key

Author: PRMerger18

articles/synapse-analytics/sql-data-warehouse/sql-data-warehouse-tables-distribute.md

@@ -87,11 +87,11 @@ WITH
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-Choosing a distribution column is an important design decision since the values in this column determine how the rows are distributed. The best choice depends on several factors, and usually involves tradeoffs. However, if you don't choose the best column the first time, you can use [CREATE TABLE AS SELECT (CTAS)](/sql/t-sql/statements/create-table-as-select-azure-sql-data-warehouse?toc=/azure/synapse-analytics/sql-data-warehouse/toc.json&bc=/azure/synapse-analytics/sql-data-warehouse/breadcrumb/toc.json&view=azure-sqldw-latest) to re-create the table with a different distribution column.
+Data stored in the distribution column can be updated. Updates to data in the distribution column could result in data shuffle operation.
 
-### Choose a distribution column that does not require updates
+Choosing a distribution column is an important design decision since the values in this column determine how the rows are distributed. The best choice depends on several factors, and usually involves tradeoffs. Once a distribution column is chosen, you cannot change it.  
 
-You cannot update a distribution column unless you delete the row and insert a new row with the updated values. Therefore, select a column with static values.
+If you didn't choose the best column the first time, you can use [CREATE TABLE AS SELECT (CTAS)](/sql/t-sql/statements/create-table-as-select-azure-sql-data-warehouse?toc=/azure/synapse-analytics/sql-data-warehouse/toc.json&bc=/azure/synapse-analytics/sql-data-warehouse/breadcrumb/toc.json&view=azure-sqldw-latest) to re-create the table with a different distribution column.
 
 ### Choose a distribution column with data that distributes evenly