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Relationship between the tables:
A relationship in a SQL Server database is a logical link between two tables. It is impossible to have a physical link. When defining a logical relationship, we’re informing SQL Server that we’ll be linking a primary key from the master table to a foreign key in another table. So already there is a need for two keys: one on each table.
A relationship in a SQL Server database is a logical link between two tables. It is impossible to have a physical link. When defining a logical relationship, we’re informing SQL Server that we’ll be linking a primary key from the master table to a foreign key in another table. So already there is a need for two keys: one on each table.
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SQL Server Tutorial
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