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Null Object Refactoring

(Brian Mains) Martin Fowler wrote a book called “Refactoring: Improving the Design of Existing Code,” and in the book he discusses the “Introduce Null Object” refactoring. Instead of assigning a null value to a reference-type property, a nullable object can be used to represent a null value, instead

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The ballad of the tuple relation

(Phil Factor) I was peacefully pottering away at my workstation, contentedly spawning a daughter thread or something similar, when Robyn popped in. She’d been wrestling with the Grouping Workbench and trying to come up with a copper-bottomed explanation for what the GROUP BY statement does. I’d been