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A comment on Against SQL. Parent comment

Re:Against SQL by goto11 on Saturday July 10, 2021 @10:29AM (#27793553)
If you put the foreign keys on the table_a/b/c tables, then you can express the same without having to introduce tagged unions.
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Re:Against SQL by laszlokorte on Saturday July 10, 2021 @10:34AM (#27793585)
As I said in response to a sibling: But can you can not (in a simple way) prevent that both a circle and a triangle point to the same user and you can not enforce a NOT NULL for a user to must have a favourite shape.
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