Occasionally,a self-join might involve the primary key of a table.

Name: Occasionally,a self-join might involve the primary key of a table.
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A self join can involve any column(s) of a table, including the primary key. In fact, a self join is a join that connects a table to itself, so it makes sense to include the primary key as one of the columns that can be used in the join condition.

Occasionally,a Self-Join Might Involve the Primary Key of a Table