Merlin Moncure schrieb am 18.10.2023 um 03:20: > The only thing you can't really do in SQL easily without writing > nasty triggers are things like, 'this table must be linked from one > and only one of these candidate tables'. I think the language > probably ought to support this, but I don't think postgres would > unless the standard did. Isn't that what assertions are intended to solve in the SQL standard?