Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> On Fri, 2007-11-09 at 04:05 -0500, Tom Lane wrote:
>> That was my first reaction too, but the point about unique-index behavior
>> refutes it. Constraining a table to have at most one row is useful.
> Sure is, and I've done it just a few days ago.
> This SQL does it using standard syntax:
> create table foo (handle integer primary key check (handle = 1));
That does not constrain the table to have only one row. It constrains
it to have only one value of the handle field (thereby making the field
useless). The fact that there are workarounds isn't a reason to not
support the index option.
regards, tom lane
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