URL details: simonreed.me/DDI/rulesforconceptualtological.php
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Database Design and Implementation - SimonReed.me
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1:1 Combine the tables or take the primary key from one into the other. 1:1 with Optionality on one end Take the primary key from the non-optional end and put it as a foreign key in the optional end. 1:1 with Optionality on both ends Create a new link tabl
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