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In a SQL Server db, what is the difference between a Primary Key and an Identity column? A column can be a primary key without being an indentity. A column cannot, however, be an identity without being a primary key.
In addition to the differences, what does a PK and Identity column offer that just a PK column doesn’t?
A column can definitely be an identity without being a PK.
An identity is simply an auto-increasing column.
A primary key is the unique column or columns that define the row.
These two are often used together, but there’s no requirement that this be so.