Know relationships between all the tables of database in SQL Server

Question

I wish to all know how the tables in my database are related to each other (i.e PK/FK/UK) and hence i created a database diagram of all my tables in SQL Server. The diagram

Answer 1

select * from information_schema.REFERENTIAL_CONSTRAINTS where 
UNIQUE_CONSTRAINT_SCHEMA = 'TABLE_NAME' 

This will list the column with TABLE_NAME and REFERENCED_COLUMN_NAME.