Most DBMS products will let you define a primary key on a column that contains null values.

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Most DBMS products will let you define a primary key on a column that contains null values.

Most DBMS products will let you define a primary key on a column that contains null values.

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Textbook

Database Processing: Fundamentals, Design, and Implementation

Edition: 15^th

Authors: Kroenke, Auer, Yoder, Vandenberg

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