On Fri, Aug 27, 2021 at 3:38 PM Peter Eisentraut < peter.eisentr...@enterprisedb.com> wrote:
> In the SQL:202x draft, this > has been formalized by making this implementation-defined and adding > an option on unique constraint definitions UNIQUE [ NULLS [NOT] > DISTINCT ] to choose a behavior explicitly. > > The CREATE UNIQUE INDEX syntax extension is not from the standard, > it's my own invention. > For the unique index syntax, should this be selectable per column/expression, rather than for the entire index as a whole? .m
