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Implementing Make Column Non Nullable

Implementing Make Column Non-Nullable Refactoring

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While working on a Legacy Application with Legacy Database design as part of fixing a bug, I thought this bug would not have ever happened if a particular column was defined as Non Nullable since this particular column was the identifier to the parent table.

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In any greenfield application (existing production application is a topic for another post). When you design table(s) lets say you have Item and Manufacturer table as shown below

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