Add Related Tables to Diagrams (Visual Database Tools)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Analytics Platform System (PDW)
You can quickly add to a database diagram all of the tables that are involved in a relationship with a selected table.
To add related tables to a diagram
Add the table with relationships to a database diagram.
Right-click the table and from the shortcut menu and click Add Related Tables.
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