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

Re:Postgres 15 improves UNIQUE and NULL by ryanbrunner on Monday July 11, 2022 @06:58AM (#32054505)
That's not quite the same, since the previous solution of unique (EmployeeName, CarID) allowed for one employee to have 2 separate cars. You have to use conditional indexes to solve this.
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