问题
I'm looking at an existing database in Microsoft SQL Server Management Studio, and in the Database Diagram there is one relatioship that appears with a dashed or dotted line. The other relationships are all solid lines. What does the dashed line mean?
回答1:
The dotted/dashed line means, that SQL Server does not enforce referential integrity for this relationship. Have a look here
回答2:
referential integrity is not enforced
来源:https://stackoverflow.com/questions/9347917/what-does-a-dashed-dotted-relationship-line-represent-in-sql-management-studio