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by branko_d
520 days ago
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NULLs are weird because they are basically two different types under the same name. The 3-value logic type is useful for representing "missing" foreign keys, but 2-value logic type is arguably more useful when searching/sorting/aggregating. I think we would have been better-off by treating FKs (and maybe outer JOINs) as a special case, and using 2-value logic everywhere else. |
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