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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Analytics Platform System (PDW)
You can create a visual diagram of your database using the Database Designer. The following articles cover the basics of using the designer to work with database diagrams.
Training
Module
Design a Performant Data Model in Azure SQL Database with Azure Data Studio - Training
Learn how to create a data model, tables, indexes, constraints, and use data types with Azure data studio.
Certification
Microsoft Certified: Azure Database Administrator Associate - Certifications
Administer an SQL Server database infrastructure for cloud, on-premises and hybrid relational databases using the Microsoft PaaS relational database offerings.
Documentation
Design Database Diagrams (Visual Database Tools)
Understand Database Diagram Ownership
Understand Database Diagram Ownership (Visual Database Tools)
Set Up Database Diagram Designer
Set Up Database Diagram Designer (Visual Database Tools)