I want to generate ER diagram of SQL database using Microsoft SQL Server Management Studio however, I dont know how to.
I found this technique online http://forums.asp.
As of Oct 2019, SQL Server Management Studio, they did not upgraded the SSMS to add create ER Diagram feature.
I would suggest try using DBWeaver from here :
https://dbeaver.io/download/
I am using Mac and Windows both and I was able to download the community edition and logged into my SQL server database and was able to create the ER diagram using the DB Weaver.