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A comment on The Logical Disaster of Null. Parent comment

Re:The Logical Disaster of Null by coldtea on Thursday May 10, 2018 @06:07AM (#17037569)
>This is why that null concept shows up repeatedly in different forms such as NaN in floating point, NULL in SQL language, etc.

NULL in SQL is also problematic -- e.g. as it behaves wrt aggregations and such. Explicitly user defined unknown values are better.

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