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A comment on Postgres 15 improves UNIQUE and NULL. Parent comment

Re:Postgres 15 improves UNIQUE and NULL by SnowHill9902 on Monday July 11, 2022 @10:02AM (#32056271)
Sure, but it’s arbitrary from a data structure standpoint and sloppy design.
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Re:Postgres 15 improves UNIQUE and NULL by ryanbrunner on Monday July 11, 2022 @11:16AM (#32057266)
SQL gives you no other options though, there's no other construct that means "not present", since NULL is unknown vs. not present.
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Re:Postgres 15 improves UNIQUE and NULL by SnowHill9902 on Monday July 11, 2022 @11:38AM (#32057555)
It depends on your column. If you have a products table and a certain handmade product has no upc, it’s correct to use ‘’ as its value rather than NULL because you know for a fact that its non-existent. Some people respect NULL too much.
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