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Applies to: 
SQL Server
You can create relationships between columns in different tables in the Diagram Designer by dragging columns between tables.
In Database Designer, click the row selector for one or more database columns that you want to relate to a column in another table.
Drag the selected column(s) to the related table.
Two dialog boxes appear: Foreign Key Relationship and Tables and Columns, with the latter appearing in the foreground.
Relationship name has a system-provided name in the format FK_localtable_foreigntable. You may change this value.
Verify that Primary key table specifies the correct table.
The grid lists the local columns and their matching foreign columns. You can add or remove table columns or change mappings.
Choose OK.
The Foreign Key Relationship dialog box appears. Selected Relationship shows the relationship you have created.
Change properties for the relationship in the grid.
Choose OK to create the relationship.
Database Designer shows a relationship between the columns you chose.
Working with Constraints
Work with Tables in Database Diagram (Visual Database Tools)
Oiliúint
Modúl
Create a relationship between tables in Microsoft Dataverse - Training
Do you need to create relationships between tables? This module will show how and why you can separate data into tables and how to relate between tables to build complex and robust business solutions. It will also explain the different kinds of relationships that you can define between tables in Dataverse.
Doiciméadúchán
Open Database Diagrams (Visual Database Tools)
Adding and Changing a Database Diagram
Walkthrough: Adding and Changing a Database Diagram
Create and update database tables.
Visual Database Tools F1 Help - Comprehensive documentation for using Visual Database Tools in SSMS.